[3.x] First-class non-HTML pages and generated discovery files (epic)

[emmadesilva]

• [3.x] Support pages with more output file extensions (Foundation) #2525
• [3.x] Support pages with more output file extensions (Realtime Compiler) #2526
• [3.x] Support pages with more output file extensions (TextPage class) #2527
• [3.x] Support pages with more output file extensions (Sitemap inclusion policy) #2528
• [3.x] Support pages with more output file extensions (Convert sitemap to a Hyde page) #2529
• [3.x] Support pages with more output file extensions (Convert RSS feed to a Hyde page) #2530
• [3.x] Support pages with more output file extensions (Add a robots.txt generator) #2531
• [3.x] Support pages with more output file extensions (Add a llms.txt generator) #2534
• [3.x] Support pages with more output file extensions (Refactors) #2540
• [3.x] Support pages with more output file extensions (Fix conflicting states) #2541
• [3.x] Support pages with more output file extensions (Remove overengineered code) #2547
• [3.x] Support pages with more output file extensions (Documentation) #2559

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d9f2e0c) to head (0899467).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##              master     #2524    +/-   ##
============================================
  Coverage     100.00%   100.00%            
- Complexity      1782      1824    +42     
============================================
  Files            184       184            
  Lines           4422      4539   +117     
============================================
+ Hits            4422      4539   +117     

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