Docs: multiple docs improvements

[dreamorosi]

What were you searching in the docs?

While reviewing the docs, I have found a number of minor inconsistencies that I'd like to fix.

Is this related to an existing documentation section?

No response

How can we improve?

Below an unordered list of improvements:

• The main and upgrade pages have some deep links to other pages that might be outdated
• A newly added environment variable (POWERTOOLS_METRICS_ENABLED) is missing from the main page & feature page
• The main page doesn't have a dedicated section for the POWERTOOLS_DEV env variable
• The Lambda layer code snippet for Amplify uses an old version of Amplify, and should be updated to use Gen 2
• The banner at the top of the page for the v1 EoE is now 3 months old, which means it can be removed
• The Metrics utility page is missing a section that explains how to use a custom logger, and details on the POWERTOOLS_METRICS_ENABLED env variable in the "testing your code" section

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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[github-actions]

This is now released under v2.12.0 version!