chore: changes to use https, and redirect of some capital letters in url

[Meng-Heng]

More on: keymanapp/keyman.com#415.

The .htaccess validation may be overlapping a bit with the existing rules in the file but this should remove the registration of 404 Not found URLs:

https://help.keyman.com/DEVELOPER/ENGINE/web/1.0/
...
https://help.keyman.com/DEVELOPER/ENGINE/web/1.0/index.php
...
https://help.keyman.com/DEVELOPER/ENGINE/WEB/10.0/guide/examples/automatic-control
https://help.keyman.com/DEVELOPER/ENGINE/web/10.0/guide/examples/automatic-control
...
https://help.keyman.com/DEVELOPER/ENGINE/web/11.0/reference/core/addHotKey.php
...
https://help.keyman.com/DEVELOPER/ENGINE/web/12.0/guide/examples
...
https://help.keyman.com/DEVELOPER/ENGINE/WEB/13.0
https://help.keyman.com/DEVELOPER/ENGINE/web/13.0/guide/
...
https://help.keyman.com/DEVELOPER/ENGINE/web/14.0/reference/core/
https://help.keyman.com/DEVELOPER/ENGINE/WEB/14.0/reference/core/addKeyboards
...=
https://help.keyman.com/DEVELOPER/ENGINE/WEB/15.0/guide/examples
...
https://help.keyman.com/DEVELOPER/ENGINE/web/16.0/
...
more

Descriptive reports: https://docs.google.com/spreadsheets/d/1On3WrJMyDo3QboQvl7S1sbtD1z3HO3JH/edit?usp=sharing&ouid=115939244027961768677&rtpof=true&sd=true

[darcywong00]

Can you separate the .htaccess change (redirect of some capital letters in url) to a separate PR?

From #691, it sounded more complicated to check all the scenarios,

[Meng-Heng]

Yes, that sounds good @darcywong00.

#1758 + #1759