chore: docs updates for 2.0

[alexeagle]

• Add a migration guide, adapted from 2.0 RELEASE #1671
• Add eslint in a few spots so it's more likely users discover it
• Promote Aspect Workflows for CI/CD

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Changes are visible to end-users: no

Test plan

Docs only

[aspect-workflows]

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Buildifier      Format

[gregmagolan]

LGTM. Thanks for summarizing.