Fixed capitalization in sidebar elements

[tshmieldev]

BEFORE:

AFTER:

Same for other elements changed

Needed to do it in _category_.json and not in README.MD because else docusaurus would create a page for those sidebar entries which would change the behavior

[Copilot]

Pull request overview

Adds Docusaurus _category_.json metadata files to control sidebar label capitalization for specific doc sections without renaming/altering markdown files (avoiding unintended page generation).

Changes:

• Added _category_.json for user/reference to display “Reference” in the sidebar.
• Added _category_.json for user/experimental/keyboard to display “Keyboard” in the sidebar.
• Added _category_.json for contributing/architecture to display “Architecture” in the sidebar.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/app-web-docs/src/docs/user/reference/category.json	Sets the sidebar category label to “Reference”.
packages/app-web-docs/src/docs/user/experimental/keyboard/category.json	Sets the sidebar category label to “Keyboard”.
packages/app-web-docs/src/docs/contributing/architecture/category.json	Sets the sidebar category label to “Architecture”.

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