docs(layer): remove link from clipboard button

[heitorlessa]

Which issue number/url will this fix?

Fixes: #1134

Summary

Changes

Please provide a summary of what's being changed

Removes href from clipboard button, so Chrome customers can correctly copy Lambda Layer ARN values.

User experience

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

Gif demonstrating that the text should continue to work, and the clipboard button will no longer be a href

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• Meet tenets criteria
• I have performed a self-review of my this change
• Changes are 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

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View rendered docs/index.md