docs: update domain name to docs.burrito.tf

[corrieriluca]

Domain name is already setup in repository's setting. This PR replaces all references of all domain to the new one.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 43.81%. Comparing base (06834f4) to head (798fad7).

Files with missing lines	Patch %	Lines
...nal/controllers/terraformpullrequest/controller.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #524   +/-   ##
=======================================
  Coverage   43.81%   43.81%           
=======================================
  Files          78       78           
  Lines        5571     5571           
=======================================
  Hits         2441     2441           
  Misses       2922     2922           
  Partials      208      208           

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