Switch link checker to lychee (and let it run more often)

.github/workflows/checks.yaml

@@ -0,0 +1,40 @@
+name: Checks
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run on the first of each month at 9:00 AM (See https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07)
+    - cron: "0 9 1 * *"
+  workflow_dispatch:
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v4
+        with:
+          show-progress: ''
+      - name: markdownlint-cli2-action
+        uses: DavidAnson/markdownlint-cli2-action@v9
+        with:
+          globs: |
+            **/*.md
+            #node_modules
+  lychee:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: 'false'
+      - name: Restore lychee cache
+        uses: actions/cache@v4
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/[email protected]
+        with:
+          fail: true
+          args: --accept '200,201,202,203,204,403,429,500' --max-concurrency 1 --cache --no-progress --exclude-all-private './**/*.md'

.lycheeignore

@@ -0,0 +1,16 @@
+https://arxiv.org/
+https://chrome.google.com/
+https://contribute.jabref.org/
+https://donations.jabref.org/
+https://pubs.acs.org/
+https://scholar.archive.org/
+https://web.archive.org/
+https://www.researchgate.net/privacy-policy
+https://www.sciencedirect.com/
+
+https://github.com/koppor/jabref/issue
+https://github.com/koppor/jabref/pull
+https://github.com/JabRef/jabref/issue
+https://github.com/JabRef/jabref/pull
+
+0005-example.md