Migrating developers' tutorial to public pages: part 4 (cmake)

This migrates the CMake tutorial from the Twiki to the public site. No changes to the tutorial content.

requested review from @akraszna

Somewhere we should add a link to our full cmake documentation: https://atlas-software.docs.cern.ch/athena/developers/cmake/

added 1 commit

• e4e769f4 - Implementing suggestions from review

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resolved all threads

@akraszna , this is "your" page so let me know if you have any comments

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• bef34a33 - Fixing link

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added 1 commit

• 7ecd611d - Formatting issue

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Unless there are comments from the others, maybe easiest to merge this now and if @akraszna has suggestions we can implement them in a separate MR?

Sounds reasonable to me.

added 8 commits

• 7ecd611d...0396fd21 - 4 commits from branch main
• bdddf2c7 - Migrating developers' tutorial to public pages: part 4 (cmake)
• 65f421ba - Implementing suggestions from review
• 7761b95c - Fixing link
• 166f18b1 - Formatting issue

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mentioned in commit ab9e61a1

merged