feat: refactor feeds; reduce dependencies

.github/workflows/scheduled-post.yaml

@@ -1,22 +0,0 @@
-name: Scheduled follow feed to Mastodon
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: '0 */2 * * *'
-jobs:
-  JSONFeed2Mastodon:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Feed to Mastodon
-        uses: nhoizey/github-action-feed-to-mastodon@v2
-        with:
-          feedUrl: "https://coryd.dev/feeds/share-follow.json"
-          mastodonInstance: "https://social.lol"
-          mastodonToken: ${{ secrets.MASTODON_TOKEN }}
-          globalDelayToots: 0
-      - name: Pull any changes from Git
-        run: git pull
-      - name: Commit and push
-        uses: stefanzweifel/git-auto-commit-action@v4