Update Pennylane.ai links to be without .html

[ashishks0522]

Changes

• Updated links to PennyLane.ai in the documentation to use the latest URL format, which excludes the .html prefix.

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[mudit2812]

Forgot to ask, but could you add an entry to the changelog under the "Documentation" section? Don't forget to add your name to the contributors :)

Forgot about changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.40%. Comparing base (1bc346a) to head (0256c34).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6412   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files         447      447           
  Lines       42418    42418           
=======================================
  Hits        42164    42164           
  Misses        254      254           

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