docs: remove about 4.x branch

Merge branch 'indrakaw-patch-1'

Merge pull request #29 from seka/master

Specify parse and execute file

Merge pull request #23 from truelineinfotech/master

CodeIgniter Developer Toolbar

Copy gitignore from CodeIgniter

Shorten the script

Update an example branch

Fix composer.json

Add about CodeIgniter REST Server

Merge pull request #6 from ricpelo/patch-1

Update install.php