feat: check markdown links (#23)

* feat: check markdown links

https://github.com/marketplace/actions/markdown-link-check

* fix: remove rollar

the repo for https://github.com/TheHumanRobot/Rollarr is gone. I have no idea why.

.github/workflows/check-markdown-links.yml

@@ -0,0 +1,14 @@
+name: Check Markdown links
+
+on:
+  push:
+  schedule:
+  - cron: "0 0 * * *"
+  workflow_dispatch:
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: gaurav-nelson/github-action-markdown-link-check@v1

README.md

@@ -87,7 +87,6 @@
 - [Rclone](https://rclone.org/) - Rclone is a command-line program to manage files on cloud storage.
 - [Recyclarr](https://github.com/recyclarr/recyclarr) - Automatically sync TRaSH guides to your Sonarr and Radarr instances.
 - [Reiverr](https://github.com/aleksilassila/reiverr) - Reiverr is a clean combined interface for Jellyfin, TMDB, Radarr and Sonarr, as well as a replacement to Overseerr.
-- [Rollarr](https://github.com/TheHumanRobot/Rollarr) - Plex Automatic Pre-roll script with a GUI.
 - [se1exin/Cleanarr](https://github.com/se1exin/Cleanarr) - A simple UI to help find and delete duplicate and sample files from your Plex server.
 - [Sonarr Episode Name Checker](https://github.com/tronyx/sonarr-episode-name-checker) - Bash and Powershell scripts to check for episodes named "Episode ##" or "TBA".
 - [StarrScripts](https://github.com/bakerboy448/StarrScripts) - Misc scripts for starr related apps.