Fix pipectl install docs sidebar

[khanhtc1202]

What this PR does / why we need it:

Fix the sidebar index showing unexpected templates, like this

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[t-kikuc]

thanks
Since v0.49.0 will be released soon, we don't need to fix v0.48.x

[khanhtc1202]

thanks Since v0.49.0 will be released soon, we don't need to fix v0.48.x

Sorry, I want to update docs v0.48.x as well, please re-approve

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.79%. Comparing base (71b46e0) to head (9df8271).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5147   +/-   ##
=======================================
  Coverage   22.79%   22.79%           
=======================================
  Files         412      412           
  Lines       43827    43827           
=======================================
  Hits         9989     9989           
  Misses      33050    33050           
  Partials      788      788           

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