Improve grammar and formatting in the README

This also clarifies the fact that Minetest saves `minetest.conf`
when closing Minetest for the first time, rather than when starting it
for the first time.

This also fixes the default key for the pitch move mode which is now P.

README.md

@@ -10,8 +10,8 @@ Minetest is a free open-source voxel game engine with easy modding and game crea
 Copyright (C) 2010-2019 Perttu Ahola <celeron55@gmail.com>
 and contributors (see source file comments and the version control log)
 
-In case you downloaded the source code:
----------------------------------------
+In case you downloaded the source code
+--------------------------------------
 If you downloaded the Minetest Engine source code in which this file is
 contained, you probably want to download the [Minetest Game](https://github.com/minetest/minetest_game/)
 project too. See its README.txt for more information.
@@ -65,7 +65,7 @@ Some can be changed in the key config dialog in the settings tab.
 | +                             | Increase view range                                            |
 | -                             | Decrease view range                                            |
 | K                             | Enable/disable fly mode (needs fly privilege)                  |
-| L                             | Enable/disable pitch move mode                                 |
+| P                             | Enable/disable pitch move mode                                 |
 | J                             | Enable/disable fast mode (needs fast privilege)                |
 | H                             | Enable/disable noclip mode (needs noclip privilege)            |
 | E                             | Move fast in fast mode                                         |
@@ -98,7 +98,7 @@ Where each location is on each platform:
 * Windows installed:
     * $bin   = `C:\Program Files\Minetest\bin (Depends on the install location)`
     * $share = `C:\Program Files\Minetest (Depends on the install location)`
-    * $user  = `%Appdata%\Minetest`
+    * $user  = `%APPDATA%\Minetest`
 * Linux installed:
     * `bin`   = `/usr/bin`
     * `share` = `/usr/share/minetest`
@@ -110,18 +110,18 @@ Where each location is on each platform:
 
 Worlds can be found as separate folders in: `user/worlds/`
 
-Configuration file:
--------------------
+Configuration file
+------------------
 - Default location:
     `user/minetest.conf`
-- It is created by Minetest when it is ran the first time.
+- This file is created by closing Minetest for the first time.
 - A specific file can be specified on the command line:
     `--config <path-to-file>`
 - A run-in-place build will look for the configuration file in
     `location_of_exe/../minetest.conf` and also `location_of_exe/../../minetest.conf`
 
-Command-line options:
----------------------
+Command-line options
+--------------------
 - Use `--help`
 
 Compiling
@@ -140,7 +140,7 @@ Compiling
 | GMP        | 5.0.0+  | Bundled mini-GMP is used if not present |
 | JsonCPP    | 1.0.0+  | Bundled JsonCPP is used if not present |
 
-For Debian/Ubuntu:
+For Debian/Ubuntu users:
 
     sudo apt install build-essential libirrlicht-dev cmake libbz2-dev libpng-dev libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev libogg-dev libvorbis-dev libopenal-dev libcurl4-gnutls-dev libfreetype6-dev zlib1g-dev libgmp-dev libjsoncpp-dev
 
@@ -194,15 +194,15 @@ Run it:
 
     ./bin/minetest
 
-- Use `cmake . -LH` to see all CMake options and their current state
+- Use `cmake . -LH` to see all CMake options and their current state.
 - If you want to install it system-wide (or are making a distribution package),
-  you will want to use `-DRUN_IN_PLACE=FALSE`
-- You can build a bare server by specifying `-DBUILD_SERVER=TRUE`
-- You can disable the client build by specifying `-DBUILD_CLIENT=FALSE`
-- You can select between Release and Debug build by `-DCMAKE_BUILD_TYPE=<Debug or Release>`
-  - Debug build is slower, but gives much more useful output in a debugger
-- If you build a bare server, you don't need to have Irrlicht installed.
-  - In that case use `-DIRRLICHT_SOURCE_DIR=/the/irrlicht/source`
+  you will want to use `-DRUN_IN_PLACE=FALSE`.
+- You can build a bare server by specifying `-DBUILD_SERVER=TRUE`.
+- You can disable the client build by specifying `-DBUILD_CLIENT=FALSE`.
+- You can select between Release and Debug build by `-DCMAKE_BUILD_TYPE=<Debug or Release>`.
+  - Debug build is slower, but gives much more useful output in a debugger.
+- If you build a bare server you don't need to have Irrlicht installed.
+  - In that case use `-DIRRLICHT_SOURCE_DIR=/the/irrlicht/source`.
 
 ### CMake options
 
@@ -291,109 +291,107 @@ Library specific options:
 
 ### Requirements
 
-* Visual Studio 2015 or newer https://visualstudio.microsoft.com
-* CMake https://cmake.org/download/
-* vcpkg https://github.com/Microsoft/vcpkg
-* git https://git-scm.com/downloads
+- [Visual Studio 2015 or newer](https://visualstudio.microsoft.com)
+- [CMake](https://cmake.org/download/)
+- [vcpkg](https://github.com/Microsoft/vcpkg)
+- [Git](https://git-scm.com/downloads)
 
-### Compiling and Installing the dependencies
+### Compiling and installing the dependencies
 
 It is highly recommended to use vcpkg as package manager.
 
 #### a) Using vcpkg to install dependencies
 
-After you successfully built vcpkg you can easily install the required libaries.
+After you successfully built vcpkg you can easily install the required libraries:
 ```powershell
 vcpkg install irrlicht zlib curl[winssl] openal-soft libvorbis libogg sqlite3 freetype luajit --triplet x64-windows
 ```
-`curl` is optional, but required to read the serverlist, `curl[winssl]` is required to use the content store.
-
-`openal-soft`, `libvorbis` and `libogg` are optional, but required to use sound.
-
-`freetype` is optional, it allows true-type font rendering.
 
-`luajit` is optional and replaces the integrated lua interpreter with a faster just in time interpreter
+- `curl` is optional, but required to read the serverlist, `curl[winssl]` is required to use the content store.
+- `openal-soft`, `libvorbis` and `libogg` are optional, but required to use sound.
+- `freetype` is optional, it allows true-type font rendering.
+- `luajit` is optional, it replaces the integrated Lua interpreter with a faster just-in-time interpreter.
 
-There are other libaries that are optional, but are not tested if they can build and linked correctly.
+There are other optional libraries, but they are not tested if they can build and link correctly.
 
-`--triplet` specify the target triplet e.g. x64-windows x86-windows
+Use `--triplet` to specify the target triplet, e.g. `x64-windows` or `x86-windows`.
 
 #### b) Compile the dependencies on your own
 
 This is outdated and not recommended. Follow the instructions on https://dev.minetest.net/Build_Win32_Minetest_including_all_required_libraries#VS2012_Build
 
 ### Compile Minetest
 
-#### a) Using the vcpkg toolchain and CMakeGUI
+#### a) Using the vcpkg toolchain and CMake GUI
 1. Start up the CMake GUI
-2. Select "Browse Source..." and select DIR/minetest
-3. Select "Browse Build..." and select DIR/minetest-build
-4. Select "Configure"
+2. Select **Browse Source...** and select DIR/minetest
+3. Select **Browse Build...** and select DIR/minetest-build
+4. Select **Configure**
 5. Choose the right visual Studio version and target platform. It has to match the version of the installed dependencies
-6. Choose "Specify toolchain file for cross-compiling" 
-7. Click "Next"
+6. Choose **Specify toolchain file for cross-compiling**
+7. Click **Next**
 8. Select the vcpkg toolchain file e.g. `D:/vcpkg/scripts/buildsystems/vcpkg.cmake`
 9. Click Finish
 10. Wait until cmake have generated the cash file
-11. If there are any errors, solve them and hit "Configure"
-12. Click "Generate"
-13. Click "Open Project"
+11. If there are any errors, solve them and hit **Configure**
+12. Click **Generate**
+13. Click **Open Project**
 14. Compile Minetest inside Visual studio.
 
 #### b) Using the vcpkg toolchain and the commandline
 
-Run the following script in Powershell:
+Run the following script in PowerShell:
 
 ```powershell
 cmake . -G"Visual Studio 15 2017 Win64" -DCMAKE_TOOLCHAIN_FILE=D:/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GETTEXT=0 -DENABLE_CURSES=0
 cmake --build . --config Release
 ```
 Make sure that the right compiler is selected and the path to the vcpkg toolchain is correct.
 
-#### c) Using your own compiled libaries
+#### c) Using your own compiled libraries
 
 **This is outdated and not recommended**
 
 Follow the instructions on https://dev.minetest.net/Build_Win32_Minetest_including_all_required_libraries#VS2012_Build
 
-### Windows Installer using WIX Toolset
+### Windows Installer using WiX Toolset
 
 Requirements:
-* Visual Studio 2017
-* Wix Toolset
+* [Visual Studio 2017](https://visualstudio.microsoft.com/)
+* [WiX Toolset](https://wixtoolset.org/)
 
-In Visual Studio 2017 Installer select "Optional Features" -> "Wix Toolset"
+In the Visual Studio 2017 Installer select **Optional Features -> WiX Toolset**.
 
-Build the binaries like described above, but make sure you unselect "RUN_IN_PLACE".
+Build the binaries as described above, but make sure you unselect `RUN_IN_PLACE`.
 
-Open the generated Project file with VS. Right click "PACKAGE" and choose "Generate".
+Open the generated project file with Visual Studio. Right-click **Package** and choose **Generate**.
 It may take some minutes to generate the installer.
 
 
 Docker
 ------
-We provide Minetest server docker images using the Gitlab mirror registry.
+We provide Minetest server Docker images using the GitLab mirror registry.
 
 Images are built on each commit and available using the following tag scheme:
 
 * `registry.gitlab.com/minetest/minetest/server:latest` (latest build)
 * `registry.gitlab.com/minetest/minetest/server:<branch/tag>` (current branch or current tag)
 * `registry.gitlab.com/minetest/minetest/server:<commit-id>` (current commit id)
 
-If you want to test it on a docker server, you can easily run:
+If you want to test it on a Docker server you can easily run:
 
 	sudo docker run registry.gitlab.com/minetest/minetest/server:<docker tag>
 
-If you want to use it in a production environment you should use volumes bound to the docker host
+If you want to use it in a production environment you should use volumes bound to the Docker host
 to persist data and modify the configuration:
 
 	sudo docker create -v /home/minetest/data/:/var/lib/minetest/ -v /home/minetest/conf/:/etc/minetest/ registry.gitlab.com/minetest/minetest/server:master
 
 Data will be written to `/home/minetest/data` on the host, and configuration will be read from `/home/minetest/conf/minetest.conf`.
 
-Note: If you don't understand the previous commands, please read the official Docker documentation before use.
+**Note:** If you don't understand the previous commands please read the official Docker documentation before use.
 
-You can also host your minetest server inside a Kubernetes cluster. See our example implementation in `misc/kubernetes.yml`.
+You can also host your Minetest server inside a Kubernetes cluster. See our example implementation in [`misc/kubernetes.yml`](misc/kubernetes.yml).
 
 
 Version scheme