Made a start on updating dead links and CI (#122)

* Add CC0 1.0 Universal License

Added the Creative Commons CC0 1.0 Universal license to the project, identical to fork master

* minor cleanup, new CI

* actions update

* add updates2mqtt and link check

* lint fixes

* More link fixes

* link fixes

* awesome-lint fixes

* remove another awesome lint disablement

* link fixes

* Fix formatting in README.md header spacing

* Add RobustMQ to MQTT broker list in README

* new links

* lint fix

.github/workflows/validate.yml

@@ -0,0 +1,14 @@
+name: CI
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [main]
+jobs:
+  Awesome_Lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - run: npx awesome-lint