Improve sections and documentations (#415)

Improve sections and documentations (#415)

* Split ABP-specific section

* Split ADG-specific section

* Split uBO-specific section

* Create common section

* Rename some headers

* Create `dist` folder automatically

* Update filters.json

* Create sections readme

* Update AGLint to v2.0

* Update AGLint config

* Temporary fixes

* Fix section descriptions

* Update AGLint to v2.0.1

* Revert "Temporary fixes"

This reverts commit 40ff29566c4841f1af8514fd6ca2eb0163d11943.

* Move back common section to its original location

* Add syntax property to the main linter config

* Fix headers

* Add `-specific` suffix to adblocker categories

* Install markdownlint

* Configure markdownlint

* Fix main README

* Section README files

* Update headers

* Create CONTRIBUTING.md

* Update README.md

* Notes about Husky

* Update README.md

* Change AGLint config files to JSON

* Update README.md

* Update README.md

* Add notice

* Fix typo