Add link checker (#178)

.github/workflows/links.yml

@@ -0,0 +1,19 @@
+name: Markdown Links Check
+
+# runs every monday at 9 am
+on:
+  # push:
+  #   branches:
+  #     - main
+  schedule:
+    - cron: "0 0 1 * *"
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          use-quiet-mode: "yes"
+          use-verbose-mode: "yes"

contributing.md

@@ -1,7 +1,5 @@
 # Contribution Guidelines
 
-Please note that this project is released with a [Contributor Code of Conduct](code-of-conduct.md). By participating in this project you agree to abide by its terms.
-
 - Ensure your pull request adheres to the following guidelines:
 - Search previous suggestions before making a new one, as yours may be a duplicate.
 - If you just created something, wait at least a couple of weeks before submitting.
@@ -20,4 +18,4 @@ Thank you for your suggestion!
 
 ### Updating your PR
 
-A lot of times, making a PR adhere to the standards above can be difficult. If the maintainers notice anything that we'd like changed, we'll ask you to edit your PR before we merge it. There's no need to open a new PR, just edit the existing one. If you're not sure how to do that, [here is a guide](https://github.com/RichardLitt/docs/blob/master/amending-a-commit-guide.md) on the different ways you can update your PR so that we can merge it.
+A lot of times, making a PR adhere to the standards above can be difficult. If the maintainers notice anything that we'd like changed, we'll ask you to edit your PR before we merge it. There's no need to open a new PR, just edit the existing one.