*  Also gfa conflicts with git shortcut

The parsing output for full git log output too slow so it replaced
with last commit show request, wich cause error if repository is empty

This reverts commit 7d298a30.

This conflicts with several tools, including NodeGH [1] and
scm_breeze [2].

[1] https://github.com/robbyrussell/oh-my-zsh/issues/5313
[2] https://github.com/robbyrussell/oh-my-zsh/issues/5321

Related: #5130

Using the "gstc" alias runs "git stash clear"
that clears every stash index

- Fix "installation" information
- Add links to github project
- Transform list of aliases into table with descriptions

Fix pj plugin

The `shwordsplit` option affects all variables and we only need to split
the `$EDITOR` variable. Because of that, using `${=spec}` is a much better
alternative.

More info at
http://zsh.sourceforge.net/Doc/Release/Expansion.html#index-SH_005fWORD_005fSPLIT_002c-toggle