Tries to clearify redirecting article
Update references to current branch

E.g. changed "2.2" to "2.3" and so on
Update overview.rst
use handleRequest() instead of bind()
Improvements to registering an extension (#2)

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #9644 (symfony) and #3231 (symfony-docs)

1. The original text is good but the topic of that paragraph is not "extension conventions" but "registering an extension" (i.e. if you follow these conventions then register goes like so ..)

2. Cleaned up different terminology "Conventions" v "Standards" -> just conventions now

3. Move this part to a more logical place. First create then register, then modify for additional needs.
Changed due to comments in repo collab
Fix formatting
Remove confusing sample code
Improve fixes
[Components][OptionsResolver] Fix&improve replaceDefaults() description
[Components][Console] Fix askConfirmation() description
add API link
Fix wrong list indentation
Update Callback.rst

add square brackets to yaml codeblock (constraints: - Callback: [validate]). Otherwise an error "Expected argument of type array, string given" is thrown
Add gender-neutrality to documentation standards

Modeled after changes made to the Django project:
https://github.com/django/django/commit/c0a2daad78c66def2ce6592977b78dab6475dd53
[Components][HttpKernel] Add FINISH_REQUEST to events table
fixed setfacl invocation
Updated install page to v2.4.*
Change link to download yuicompressor
Fix some bash and text code blocks