Update Multipass redirects to stable version

[geoffreynyaga]

Multipass documentation now uses versioned content with stable and latest. The stable version is now the default. This PR updates the redirects to point to the stable docs.

Done

• Update the Multipass redirect links to point to stable documentation.
• Remove the language string (/en/) from the urls. There is already a ReadTheDocs redirect in place to resolve if the language string is present, but removing them nonetheless creates cleaner urls as intended.
• Add trailing / to the links

QA

• Manually check each link is correct (opens the correct page on a browser)

Issue / Card

https://warthogs.atlassian.net/browse/MULTI-2440

[webteam-app]

geoffreynyaga is not a collaborator of the repo

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 78.12%. Comparing base (068b523) to head (e19caa9). :warning: Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2162      +/-   ##
==========================================
+ Coverage   77.20%   78.12%   +0.92%     
==========================================
  Files          16       16              
  Lines        1676     1678       +2     
==========================================
+ Hits         1294     1311      +17     
+ Misses        382      367      -15     

Flag	Coverage Δ
python	78.12% <ø> (+0.92%)	:arrow_up:

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