Update PR template

[Brandon32]

• Update PR template to use published content to get lighthouse scores.

Resolves: #106

Test URLs:

• Before: https://main--bacom--adobecom.hlx.live/?martech=off
• After: https://bmarshal-pr-template-live--bacom--adobecom.hlx.live/?martech=off

[aem-code-sync]

Hello, I'm Franklin Bot and I will run some test suites that validate the page speed.
In case there are problems, just click the checkbox below to rerun the respective action.

• Re-run PSI Checks

[aem-code-sync]

Page	Scores	Audits	Google
/?martech=off

[codecov-commenter]

Codecov Report

Merging #124 (2d8006c) into main (3bf4b2d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   96.36%   96.36%           
=======================================
  Files           6        6           
  Lines         468      468           
=======================================
  Hits          451      451           
  Misses         17       17           

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