Adding Coderabbit as a PR sponsor (#1682)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
<!-- coderabbit-ai-generated:v1 -->

## Summary by CodeRabbit

* **Documentation**
* Added a Sponsors section to the README recognizing CodeRabbit and
linking to its logo.
* **Chores**
* Removed the automated pull-request review workflows for repository and
fork pull requests. These workflows no longer trigger review runs for
the pull-request events they previously handled.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/jules-pr-reviewer-forks.yml

@@ -1,37 +0,0 @@
-name: Jules PR Review (forks)
-# Fork PRs get no secrets under pull_request, so they are reviewed here under
-# pull_request_target, which runs this file from main with the repo's secrets.
-# That is safe only while nothing here checks out or runs the PR's code: the
-# action reads the diff through the API. Upstream jules-pr-reviewer refuses
-# this event, hence the calibrain fork.
-# The jules-forks environment has no required reviewers on purpose, so fork
-# pushes are reviewed straight away; adding reviewers there (Settings →
-# Environments) would make each run wait for a maintainer's approval.
-on:
-  pull_request_target:
-    types: [opened, synchronize, reopened, ready_for_review]
-permissions: {}
-
-concurrency:
-  # Not jules-review-: the same-repo workflow's skipped runs would cancel this one
-  group: jules-review-fork-${{ github.event.pull_request.number }}
-  cancel-in-progress: true
-
-jobs:
-  review:
-    # Drafts are skipped here rather than by the action, so they never start a job
-    if: github.event.pull_request.head.repo.full_name != github.repository && !github.event.pull_request.draft
-    runs-on: ubuntu-latest
-    environment:
-      name: jules-forks
-      deployment: false
-    permissions:
-      pull-requests: write
-      contents: read
-      checks: write
-    steps:
-      - uses: calibrain/jules-pr-reviewer@v0.0.3
-        with:
-          jules_api_key: ${{ secrets.JULES_API_KEY }}
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          skip_forks: false

.github/workflows/jules-pr-reviewer.yml

@@ -1,27 +0,0 @@
-name: Jules PR Review
-# Reviews PRs whose branch lives in this repo. Fork PRs get no secrets under
-# pull_request and Dependabot runs get only Dependabot secrets, so
-# JULES_API_KEY would be empty for both; jules-pr-reviewer-forks.yml reviews
-# fork PRs instead.
-on:
-  pull_request:
-    types: [opened, synchronize, reopened, ready_for_review]
-permissions: {}
-
-concurrency:
-  group: jules-review-${{ github.event.pull_request.number }}
-  cancel-in-progress: true
-
-jobs:
-  review:
-    if: github.event.pull_request.head.repo.full_name == github.repository && github.actor != 'dependabot[bot]'
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-      contents: read
-      checks: write
-    steps:
-      - uses: calibrain/jules-pr-reviewer@v0.0.3
-        with:
-          jules_api_key: ${{ secrets.JULES_API_KEY }}
-          github_token: ${{ secrets.GITHUB_TOKEN }}

readme.md

@@ -324,6 +324,20 @@ make restart     # Restart container
 
 The frontend dev server proxies to the backend on port 8084.
 
+
+## Sponsors
+
+Code review on Shelfmark's pull requests is sponsored by [CodeRabbit](https://coderabbit.link/calibrain).
+
+<a href="https://coderabbit.link/calibrain">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://www.coderabbit.ai/content/assets/white-typemark.svg">
+    <source media="(prefers-color-scheme: light)" srcset="https://www.coderabbit.ai/content/assets/orange-typemark.svg">
+    <img src="https://www.coderabbit.ai/content/assets/orange-typemark.svg" alt="CodeRabbit" width="240">
+  </picture>
+</a>
+
+
 ## License
 
 MIT License - see [LICENSE](LICENSE) for details.