Migrate documentation automation to Depot CI

[marccampbell]

Summary

• replace nine GitHub Actions workflows with three Depot CI workflows for PR checks, main-branch automation, and release notes
• prevent all fork PR jobs from running; same-repository PRs only
• replace Dependabot with a weekly Factory dependency-update workflow
• keep the Factory workspace definition out of this repository; it now lives in replicatedhq/factory-workspaces#13
• pin retained action and tool dependencies and move release-note generation and Vale review into auditable scripts
• add the missing Replicated SDK release-notes insertion marker used by the automation

External configuration completed

• granted the existing Depot Code Access installation access to only replicatedhq/replicated-docs in addition to its prior allowlist
• imported all 11 required GitHub Actions secrets as Depot variants scoped to replicatedhq/replicated-docs
• reused the existing Depot organization Factory token
• removed the temporary one-shot migration branch after a successful transfer

Validation

• depot ci migrate preflight --yes
• pinned actionlint against all three Depot workflows
• shell syntax and YAML parsing
• all six release-note event mappings plus empty-output behavior
• pinned release-notes generator compilation
• npm ci
• npm run build
• live Depot PR checks for labeling, Vale, and Factory workflow validation
• git diff --check

The Docusaurus build passes with the repositories existing broken-link and broken-anchor warnings.

Merge order

Merge replicatedhq/factory-workspaces#13 first so the replicated-docs workspace exists before this PR publishes its dependency workflow. This PR is intentionally not merged.

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[xavpaice]

See https://github.com/replicatedhq/factory-workspaces/pull/12 if we want to move the factory workflow out of this repo