chore(docs): add customer references section

[dreamorosi]

Description of your changes

This PR introduces a new section to the docs homepage that gives more details to the reader on how to support Powertools and also adds the customer references that were shared with this repo.

The PR also adds a new page called "We Made This (Community)" that contains community content that was submitted and/or published about Powertools.

The PR is a followup of the aws-powertools/powertools-lambda-python#2159 and once merged will close #1271.

Related issues, RFCs

Issue number: #1271

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding changes to the examples
• My changes generate no new warnings
• The code coverage hasn't decreased
• I have added tests that prove my change is effective and works
• New and existing unit tests pass locally and in Github Actions
• Any dependent changes have been merged and published
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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