Customize: Nest static page admin panel under v12

[Samk13]

:heart: Thank you for your contribution!

Description

Place the admin panel under v12, as its current positioning misleadingly suggests that v11 includes this feature.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• [x] I'm aware of the code of conduct.
• [x] I've created logical separate commits and followed the commit message format.
• [x] I've added relevant test cases.
• [x] I've added relevant documentation.
• [x] I've marked translation strings (for relevant code).
• [x] I've followed the CSS/JS and React guidelines (for relevant code).
• [x] I've followed the web accessibility guidelines (for relevant code).
• [x] I've followed the user interface guidelines (for relevant code).
• [x] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• [x] I've NOT included third-party code (copy/pasted source code or new dependencies).

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[Samk13]

@fenekku I hope I've understood you correctly. As Changing the base template section I'm not 100 if it pertains to V11 or 12. If there's anything else that requires adjustments, please let me know or feel free to edit it yourself, your hands are free here :)

[fenekku]

@fenekku I hope I've understood you correctly. As Changing the base template section I'm not 100 if it pertains to V11 or 12. If there's anything else that requires adjustments, please let me know or feel free to edit it yourself, your hands are free here :)

Your changes are right on what I meant. Merging, thank you!