Add token rotation section to docs

[misscoded]

Summary

Add section to documentation that outlines token rotation and links out to corresponding spec + API documentation.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #1009 (efc3a26) into main (b0343da) will not change coverage.
The diff coverage is n/a.

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  Coverage   66.41%   66.41%           
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  Files          13       13           
  Lines        1212     1212           
  Branches      357      357           
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  Hits          805      805           
  Misses        338      338           
  Partials       69       69           

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[misscoded]

Once the copy/content is agreed upon, need to introduce it into the Japanese docs, as well.

[stevengill]

Looks great! It would be nice to point out the minimum version of bolt that ships with token rotation support.

[seratch]

As one of the prerequisites on the Bolt app side, we can mention the necessity to use @slack/oauth package's default authorize function along with InstallationStore. This sounds obvious to us but it's not the same particularly for the developers who are new to Bolt.

Also, we may want to update the OAuth package's document as well.

[seratch]

Left one more comment on the link but this looks almost ready

[seratch]

Directly linking to the underlying OAuth package may confuse readers. How about navigating to bolt-js's OAuth document instead?

Suggested change

	Bolt for JavaScript supports and will handle token rotation automatically so long as the [built-in OAuth](https://slack.dev/node-slack-sdk/oauth) functionality is used.
	Bolt for JavaScript supports and will handle token rotation automatically so long as the [built-in OAuth](https://slack.dev/bolt-js/concepts#authenticating-oauth) functionality is used.

[seratch]

Forgot to mention this:

For the Japanese translation work, can you create a “good first issue” like this? #994 I can work on it but am also happy to have the contributions from the community!