removed absolute links

cli50.md

@@ -1,12 +1,12 @@
 # `cli50`
 
-`cli50` is a command-line tool via which you can (easily!) mount a directory within a container running [`cs50/cli`](/cs50/cli), a Docker image based on Ubuntu 18.04, a popular distribution of Linux. We use `cli50` to work on CS50's own apps in a standard, contained environment, without having to install apps' dependencies on our own Macs and PCs. It provides a command-line environment similar, but not quite identical to, a terminal window on [CS50 IDE](/ide). 
+`cli50` is a command-line tool via which you can (easily!) mount a directory within a container running [`cs50/cli`](cs50/cli), a Docker image based on Ubuntu 18.04, a popular distribution of Linux. We use `cli50` to work on CS50's own apps in a standard, contained environment, without having to install apps' dependencies on our own Macs and PCs. It provides a command-line environment similar, but not quite identical to, a terminal window on [CS50 IDE](ide). 
 
 ## Installation
 
-1. Install [Docker](/docker), if you haven't already.
-1. Install [Python 3.6](/python) or later, if you haven't already.
-1. Install [`pip`](/pip), if you haven't already.
+1. Install [Docker](docker), if you haven't already.
+1. Install [Python 3.6](python) or later, if you haven't already.
+1. Install [`pip`](pip), if you haven't already.
 1. Install `cli50` itself:
     ```
     pip install cli50
@@ -79,7 +79,7 @@ cli50 --fast
 
 ### Log into running container
 
-If a container (based on any Docker image, [`cs50/cli`](/cs50/cli) or otherwise) is already running, you can spawn a login shell within it as follows:
+If a container (based on any Docker image, [`cs50/cli`](cs50/cli) or otherwise) is already running, you can spawn a login shell within it as follows:
 
 ```
 cli50 -l

docker.md

@@ -1,6 +1,6 @@
 # Docker
 
-[CS50 IDE](/ide) and [`cli50`](/cli50) (as well as CS50's web apps) are implemented with [containers](https://www.docker.com/what-container), "a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, runtime, system tools, system libraries, settings."
+[CS50 IDE](ide) and [`cli50`](cli50) (as well as CS50's web apps) are implemented with [containers](https://www.docker.com/what-container), "a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, runtime, system tools, system libraries, settings."
 
 To run containers on your own Mac or PC, you just need to install a container platform like [Docker Community Edition](https://www.docker.com/what-docker) (CE), which is freely available for
 

pip.md

@@ -1,8 +1,8 @@
 # `pip`
 
-Most of CS50's command-line tools, including [`check50`](/check50), [`cli50`](/cli50), [`render50`](/render50), [`style50`](/style50), [`submit50`](/submit50), are implemented in Python and can be installed on your own Mac or PC via `pip`, a command-line tool via which you can install Python packages from [PyPI](https://pypi.org/), "the default [package index](https://packaging.python.org/glossary/#term-package-index) for the Python community."
+Most of CS50's command-line tools, including [`check50`](check50), [`cli50`](cli50), [`render50`](render50), [`style50`](style50), [`submit50`](submit50), are implemented in Python and can be installed on your own Mac or PC via `pip`, a command-line tool via which you can install Python packages from [PyPI](https://pypi.org/), "the default [package index](https://packaging.python.org/glossary/#term-package-index) for the Python community."
 
-If you already have [`python`](/python) installed, odds are you also have have `pip`. If not, you can install it for
+If you already have [`python`](python) installed, odds are you also have have `pip`. If not, you can install it for
 
 * Linux
   * [Arch Linux](https://packaging.python.org/guides/installing-using-linux-tools/#arch-linux)

python.md

@@ -1,6 +1,6 @@
 # `python`
 
-Most of CS50's command-line tools, including [`check50`](/check50), [`cli50`](/cli50), [`render50`](/render50), [`style50`](/style50), [`submit50`](/submit50), require that you have Python 3.6 or higher installed, since CS50 [uses f-strings](https://www.python.org/dev/peps/pep-0498/) and [assumes that keyword arguments are ordered](https://www.python.org/dev/peps/pep-0468/). (If you already have Python installed on your Mac or PC but didn't install it yourself, odds are it's a version older than 3.6.) You can install the latest version of Python, 3.7, for
+Most of CS50's command-line tools, including [`check50`](check50), [`cli50`](cli50), [`render50`](render50), [`style50`](style50), [`submit50`](submit50), require that you have Python 3.6 or higher installed, since CS50 [uses f-strings](https://www.python.org/dev/peps/pep-0498/) and [assumes that keyword arguments are ordered](https://www.python.org/dev/peps/pep-0468/). (If you already have Python installed on your Mac or PC but didn't install it yourself, odds are it's a version older than 3.6.) You can install the latest version of Python, 3.7, for
 
 * Linux, via [`pyenv`](https://github.com/pyenv/pyenv#installation)
 * macOS, via [installer](https://www.python.org/ftp/python/3.7.0/python-3.7.0-macosx10.9.pkg) or [`pyenv`](https://github.com/pyenv/pyenv#homebrew-on-mac-os-x)

render50.md

@@ -10,9 +10,9 @@ PDFs can be annotated (for free) with:
 
 ## Installation
 
-1. Install [Docker](/docker), if you haven't already.
-1. Install [Python 3.6](/python) or later, if you haven't already.
-1. Install [`pip`](/pip), if you haven't already.
+1. Install [Docker](docker), if you haven't already.
+1. Install [Python 3.6](python) or later, if you haven't already.
+1. Install [`pip`](pip), if you haven't already.
 1. Install `render50` itself:
     ```
     pip install render50