MWPW-137722 - Adding sitemap index

[JasonHowellSlavin]

• Adds a sitemap-index.xml

Resolves: MWPW-137722

Test URLs:
N/A

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some test suites that validate the page speed.
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• Re-run PSI Checks

[codecov-commenter]

Codecov Report

Merging #19 (9579c1a) into main (cb3346a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   86.36%   86.36%           
=======================================
  Files           2        2           
  Lines         176      176           
=======================================
  Hits          152      152           
  Misses         24       24           

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