Updated documentation
Updated documentation

- Updated Badges
- Moved the introduction back to the top
- Added a title for the TOC list
- Added "Latest" sub-section (closes #521)
- Added "Case-insensitivity" sub-section (see #518)
- Added "Backtracking" sub-section (closes #438)
- Fixed link for . (dot character)
- Added a title for the links in the development section
- Added "Contribution" sub-section (closses #457)
- Updated the TOC list

pegjs/pegjs,pegjs/pegjs,Mingun/pegjs,Mingun/pegjs