fix(argo-cd): Update CONTRIBUTING docs (#1782)

* Update CONTRIBUTING

- [x] versioning details
- [x] remove broken links
- [x] fix markdown linting errors
- [x] README.md updating clarification

* Rename variable in helm-docs script
* Update argo-cd README
* Add blurb about mandatory Chart versioning
* Reword artifacthub changes section in CONTRIBUTING
* Reorder/restructure CONTRIBUTING.md
* Update argo-cd chart version
* Add section in CONTRIBUTING about semantic title linting

Signed-off-by: jmeridth <jmeridth@gmail.com>
Co-authored-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

scripts/helm-docs.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
 ## Reference: https://github.com/norwoodj/helm-docs
 set -eux
-CHART_DIR="$(cd "$(dirname "$0")/.." && pwd)"
-echo "$CHART_DIR"
+REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+echo "$REPO_ROOT"
 
 echo "Running Helm-Docs"
 docker run \
-    -v "$CHART_DIR:/helm-docs" \
+    -v "$REPO_ROOT:/helm-docs" \
     -u $(id -u) \
     jnorwood/helm-docs:v1.9.1