[tess.example.yml] arranging TeSS::Config.feature list

[kennethrioja]

Summary of changes

• Organizing the list of features in tess.example.yml

Motivation and context

• As I am starting to add a certain number of features, it would make sense to arrange them instead of just randomly throwing each feature in the feature bag – as an LLM may sell it "This drastically improves the DX"
• For new TeSS maintainers this arrangement might help + I can see this list being matched with a devs' documentation that explains all features and its effects/changes on the platform.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.

[Copilot]

Pull request overview

This PR reorganizes the feature configuration in tess.example.yml to improve readability and maintainability by grouping related features into logical categories. The changes add section comments to categorize features into "TeSS main resources", "Resources' features", "User login", "User rights", and "UI" sections.

Changes:

• Reorganized feature flags into logical, commented sections for better clarity
• Updated the "Possible features to disable" comment to include additional options
• Minor comment wording adjustment from "Be careful!" to "Caution!"

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[Copilot]

There's a missing comma after "approved_editors" in the list of possible features to disable. The list should have commas between all items.

Suggested change

	# other_types, subsets, syllabus, approved_editors address_finder,
	# other_types, subsets, syllabus, approved_editors, address_finder,