DEVX-118: feat: enhance documentation-as-code with badges, version refs, Vale

- Fix badge system: clean .badges dir from orphan branch, add version
  verification, make badges job depend on release (avoids stale version
  badge race condition)
- Add check_doc_versions.py: lint tool that verifies docs version
  references match current __version__, with --fix for auto-update
- Integrate check_doc_versions into release process (auto-updates docs
  on every release commit)
- Add Vale prose linter integration: .vale.ini, custom styles for
  terminology and code block language, CI step, make target
- Fix stale version references in docs (0.27.0 → 0.33.4)
- Fix e.g. → for example in docs (Google.Latin Vale rule)
- Add CI steps for check_doc_versions and Vale to quality workflow
- Add make targets: devx-check-doc-versions, devx-vale

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.vale/styles/devx/CodeBlockLanguage.yml

@@ -0,0 +1,6 @@
+extends: existence
+message: "Unlabeled code block — add a language tag (```bash, ```yaml, etc.)"
+level: warning
+scope: raw
+raw:
+  - '(?s)```\n(?!.*```)'

.vale/styles/devx/Condescending.yml

@@ -0,0 +1,13 @@
+extends: existence
+message: "Avoid '%s' — it's condescending in technical documentation"
+level: warning
+ignorecase: true
+tokens:
+  - '\bsimply\b'
+  - '\bjust\b'
+  - '\bobviously\b'
+  - '\bof course\b'
+  - '\bas you (can )?see\b'
+  - '\beasily\b'
+  - '\btrivial\b'
+  - '\bstraightforward\b'

.vale/styles/devx/README.md

@@ -0,0 +1,2 @@
+# Custom Vale style for devx documentation
+# Project-specific terminology and style rules

.vale/styles/devx/Terminology.yml

@@ -0,0 +1,11 @@
+extends: substitution
+message: "Use '%s' instead of '%s' (terminology consistency)"
+level: error
+ignorecase: false
+swap:
+  '\b(?i)gitea\b': Gitea
+  '\b(?i)zitadel\b': ZITADEL
+  '\b(?i)opentofu\b': OpenTofu
+  '\b(?i)vaultwarden\b': Vaultwarden
+  '\b(?i)nextcloud\b': Nextcloud
+  '\b(?i)mattermost\b': Mattermost