[Feature] Centralize developer docs

[mikealfare]

Is this your first time submitting a feature request?

• [X] I have read the expectations for open source contributors
• [X] I have searched the existing issues, and I could not find an existing issue for this feature
• [X] I am requesting a straightforward extension of existing dbt-adapter functionality, rather than a Big Idea better suited to a discussion

Describe the feature

We have several sets of docs for each adapter. These point to dbt-core in many cases. But the relevant repo should really be dbt-adapters now. We want to make this an information hub for third party adapter maintainers. This will help drive consistency across first party adapters as well as drive traffic to this repo. Here's where some existing OSS/Adapter docs currently live:

• https://github.com/dbt-labs/dbt-core/blob/main/CONTRIBUTING.md
• https://docs.getdbt.com/community/resources/oss-expectations
• https://docs.getdbt.com/community/contribute
• https://docs.getdbt.com/community/resources/oss-expectations#youve-opened-a-new-issue-what-can-you-expect-to-happen

Describe alternatives you've considered

No response

Who will this benefit?

• Third party adapter maintainers
• First party adapter maintainers (hey, that's us!)
• Contributors

Are you interested in contributing this feature?

No response

Anything else?

No response

[github-actions[bot]]

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