SRE-1079: Remove the shared actions, workflows and Renovate preset moved to hashintel/actions

[TimDiekmann]

The composite actions, reusable workflows and Renovate preset move out of this repository. hashintel/actions has hosted copies of them since hashintel/actions#1. This repository keeps profile/README.md, LICENSE.md and README.md.

Related links

• SRE-1079 (internal)
• SRE-1079: Copy shared actions, workflows and Renovate preset from .github actions#1

What does this change?

• It deletes .github/actions/ (decrypt-secret, encrypt-secret, github-app-token, install-renovate) and .github/workflows/.
• It deletes the shared preset renovate-config.json, this repository's own renovate.json and .gitignore.
• It removes the renovate-config.json entry from the file list in README.md.

Before merging

• Callers that pin hashintel/.github/...@<sha> keep working after the merge, because pinned commits stay reachable. Callers that extend github>hashintel/.github:renovate-config read the preset from main and fail once it is gone, so every caller has to extend github>hashintel/actions:renovate-config first.
• The branch ruleset requires Scan, Review, Validate renovate config, Linear Issue ID and Validate shell scripts. This PR deletes the workflows that report them, so those required checks have to come out of the ruleset before it can merge.
• SRE-1092: Update renovate #111 updates renovate in install-renovate, which this PR deletes. That update has to land in hashintel/actions instead.

[cursor]

PR Summary

Medium Risk
Deletes org-wide CI/Renovate assets and breaks callers still extending hashintel/.github:renovate-config or required checks tied to removed workflows until repos and rulesets are migrated.

Overview
This PR strips CI, shared actions, and Renovate from hashintel/.github now that those live in hashintel/actions. The repo is narrowed to community-health defaults (README, LICENSE, profile/README, etc.).

Removed: all of .github/actions/ (secret encrypt/decrypt, Vault-backed GitHub App token minting, pinned Renovate install) and .github/workflows/ (central Renovate, actionlint, dependency review, PR title / TODO checks, shellcheck + Renovate config validation). Also deleted the org-wide renovate-config.json, this repo’s renovate.json, and .gitignore.

README no longer lists renovate-config.json as a planned shared file.

Operational impact: consumers must point Renovate at github>hashintel/actions:renovate-config before main loses the preset; branch protection required checks that depended on the deleted workflows must be updated before merge.

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