docs: add link to Powertools for AWS Lambda workshop

[dreamorosi]

Please provide the issue number

Issue number: #580

Summary

Changes

Please provide a summary of what's being changed

This PR adds a link to the Powertools for AWS Lambda workshop in the documentation sidebar. This will allow customers to know about the existence of the workshop.

User experience

Please share what the user experience looks like before and after this change

Note: the screenshot is from the TypeScript docs, however it'll look the same in yours

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.
In the meantime, check out the #dotnet channel on our Powertools for AWS Lambda Discord: Invite link

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.91%. Comparing base (ff53f97) to head (b1f53c5).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #581      +/-   ##
===========================================
- Coverage    72.95%   72.91%   -0.05%     
===========================================
  Files          109      109              
  Lines         4489     4489              
  Branches       455      455              
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- Hits          3275     3273       -2     
- Misses        1085     1087       +2     
  Partials       129      129              

Flag	Coverage Δ
unittests	72.91% <ø> (-0.05%)	⬇️

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[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!