Updates to Index and FAQs pages

[sekyondaMeta]

1. Adding LMI page to Serve landing page.
2. Adding CPU performance to FAQs
3. Minor update to CPU performance section in performance doc

Fixes #(issue)

To make CPU performance material and LMI information more visible

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

Pages built locally:

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2524 (51f38c5) into master (2a386ec) will not change coverage.
The diff coverage is n/a.

❗ Current head 51f38c5 differs from pull request most recent head e5a2a26. Consider uploading reports for the commit e5a2a26 to get more accurate results

@@           Coverage Diff           @@
##           master    #2524   +/-   ##
=======================================
  Coverage   72.64%   72.64%           
=======================================
  Files          79       79           
  Lines        3733     3733           
  Branches       58       58           
=======================================
  Hits         2712     2712           
  Misses       1017     1017           
  Partials        4        4           

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