feat: Remove repository-sync workflows in favor of github-docs-bot (#15097)

* Revert "fix: ensure untrack correctly retains the active reaction (#15065)"

This reverts commit 2ad519542d.

* feat: Remove repository-sync workflows in favor of github-docs-bot

* Revert "Revert "fix: ensure untrack correctly retains the active reaction (#15065)""

This reverts commit f4e98bf89f.

.github/workflows/docs-preview-create-request.yml

@@ -1,26 +0,0 @@
-# https://github.com/sveltejs/svelte.dev/blob/main/apps/svelte.dev/scripts/sync-docs/README.md
-name: Docs preview create request
-
-on:
-  pull_request_target:
-    branches:
-      - main
-
-jobs:
-  dispatch:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Repository Dispatch
-        uses: peter-evans/repository-dispatch@v3
-        with:
-          token: ${{ secrets.SYNC_REQUEST_TOKEN }}
-          repository: sveltejs/svelte.dev
-          event-type: docs-preview-create
-          client-payload: |-
-            {
-              "package": "svelte",
-              "repo": "${{ github.repository }}",
-              "owner": "${{ github.event.pull_request.head.repo.owner.login }}",
-              "branch": "${{ github.event.pull_request.head.ref }}",
-              "pr": ${{ github.event.pull_request.number }}
-            }

.github/workflows/docs-preview-delete-request.yml

@@ -1,27 +0,0 @@
-# https://github.com/sveltejs/svelte.dev/blob/main/apps/svelte.dev/scripts/sync-docs/README.md
-name: Docs preview delete request
-
-on:
-  pull_request_target:
-    branches:
-      - main
-    types: [closed]
-
-jobs:
-  dispatch:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Repository Dispatch
-        uses: peter-evans/repository-dispatch@v3
-        with:
-          token: ${{ secrets.SYNC_REQUEST_TOKEN }}
-          repository: sveltejs/svelte.dev
-          event-type: docs-preview-delete
-          client-payload: |-
-            {
-              "package": "svelte",
-              "repo": "${{ github.repository }}",
-              "owner": "${{ github.event.pull_request.head.repo.owner.login }}",
-              "branch": "${{ github.event.pull_request.head.ref }}",
-              "pr": ${{ github.event.pull_request.number }}
-            }

.github/workflows/sync-request.yml

@@ -1,22 +0,0 @@
-# https://github.com/sveltejs/svelte.dev/blob/main/apps/svelte.dev/scripts/sync-docs/README.md
-name: Sync request
-
-on:
-  push:
-    branches:
-      - main
-
-jobs:
-  dispatch:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Repository Dispatch
-        uses: peter-evans/repository-dispatch@v3
-        with:
-          token: ${{ secrets.SYNC_REQUEST_TOKEN }}
-          repository: sveltejs/svelte.dev
-          event-type: sync-request
-          client-payload: |-
-            {
-              "package": "svelte"
-            }