Maintenance: update project's description

[dreamorosi]

Summary

After different exchanges with the community & customers we feel the need to update the definition of Powertools to better express what the project is about, and how it can help customers.

Why is this needed?

We want to better frame what Powertools' focus is in our copy.

Which area does this relate to?

Governance

Solution

No response

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java

[github-actions]

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