Fix README and remove unnecessary commands

The README was simplified and the example to install the
Snippy tool was removed. The original intention was to
highlight that the plugin and tool must be installed into
the same Python namespace (local or global) to find the
plugins. Then it was thought that the default README has
to be as simple and short as possible without any bloat.

Signed-off-by: Heikki Laaksonen <laaksonen.heikki.j@gmail.com>

README.rst

@@ -27,17 +27,14 @@ To import defined tldr man pages remotely, run:
 
 .. code:: text
 
-    pip install snippy --user
     snippy import --plugin tldr --file https://github.com/tldr-pages/tldr/tree/master/pages/osx
 
 To import defined tldr man pages locally, run:
 
 .. code:: text
 
-    mkdir ${HOME}/tmp && cd $_
     git clone https://github.com/tldr-pages/tldr.git
-    pip install snippy --user
-    snippy import --plugin tldr --file file:.tldr/pages/linux
+    snippy import --plugin tldr --file file:./tldr/pages/linux
 
 .. _Snippy: https://github.com/heilaaks/snippy