History: Guidelines for intro page for each release

             For each major release, we have a page such as:

- ((Tiki27))
- ((Tiki26))
- ((Tiki25))
- ...


This page is to collaborate on guidelines for these pages.

Goals:

1. Help people decide if they should upgrade
2. Help people understand Tiki (know what it does, and what is evolving)


Sections:

1. Infrastructure 
    - Useful, but shouldn't add new features or affect end users (Smarty, jQuery, build system PHPUnit..., refactoring)
2. Enhancement 
    - New feature (big or small), (UI / UX improvement), replacements (which affect end user), notable bug fixes, etc.
3. Removals
4. Upgrade notes 
    - Known issues / regressions which may prevent you from upgrading / a change which may be disruptive


See also ((dev:Commit Tags))