fix: support __index.txt to custom sort help page index #2360
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If a file __index.txt exists in a folder, it should list the .php and .md files in the desired order for display in the left hand navigation menu. A file prefixed by a hyphen will be excluded from the index, and other files not in the file will be listed in their default alphabetical order afterwards.
The example __index.txt files will be added to the keyman repository for help deployment.
Test-bot: skip
Fixes: #1780