chore: remove helm chart (migrated to cbcoutinho/helm-charts)

The helm chart has been migrated to a dedicated repository at
https://github.com/cbcoutinho/helm-charts. This removes the chart
source, release workflow, bump script, and updates all documentation
to point to the new repository.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -2,58 +2,35 @@
 
 ## Version Management
 
-This monorepo uses commitizen for version management with **independent versioning** for two components:
+This project uses [commitizen](https://commitizen-tools.github.io/commitizen/) for version management following PEP 440 (`major_version_zero = true`, 0.x.x for pre-1.0).
 
-### Components
-
-| Component | Scope | Bump Command | Tag Example |
-|-----------|-------|--------------|-------------|
-| MCP Server | `mcp` or none | `./scripts/bump-mcp.sh` | `v0.54.0` |
-| Helm Chart | `helm` | `./scripts/bump-helm.sh` | `nextcloud-mcp-server-0.54.0` |
-
-> **Note:** The Astrolabe Nextcloud app has been moved to its own repository at [cbcoutinho/astrolabe](https://github.com/cbcoutinho/astrolabe).
+> **Note:** The Helm chart has been moved to [cbcoutinho/helm-charts](https://github.com/cbcoutinho/helm-charts). The Astrolabe Nextcloud app has been moved to [cbcoutinho/astrolabe](https://github.com/cbcoutinho/astrolabe).
 
 ### Commit Message Format
 
-Use conventional commits with **scopes** to target specific components:
+Use [conventional commits](https://www.conventionalcommits.org/):
 
 ```bash
-# MCP server changes
+feat: add new feature
 feat(mcp): add calendar sync API
-fix(mcp): resolve authentication bug
-
-# Helm chart changes
-feat(helm): add resource limits
-docs(helm): update values documentation
-```
-
-**Unscoped commits** default to the MCP server:
-```bash
-feat: add new feature  # → MCP server (v0.54.0)
+fix: resolve authentication bug
+docs: update README
 ```
 
 ### Release Workflow
 
-#### 1. Make Changes with Scoped Commits
+#### 1. Make Changes with Conventional Commits
 
 ```bash
-git commit -m "feat(helm): add ingress annotations"
-git commit -m "feat(mcp): add calendar sync"
+git commit -m "feat: add calendar sync"
 ```
 
-#### 2. Bump Component Versions
+#### 2. Bump Version
 
 ```bash
-# Bump MCP server (reads commits with scope=mcp or unscoped)
 ./scripts/bump-mcp.sh
 # → Creates tag: v0.54.0
-# → Updates: pyproject.toml, Chart.yaml:appVersion
-
-# Bump Helm chart (reads commits with scope=helm)
-./scripts/bump-helm.sh
-# → Creates tag: nextcloud-mcp-server-0.54.0
-# → Updates: Chart.yaml:version
-
+# → Updates: pyproject.toml
 ```
 
 #### 3. Push Tags
@@ -62,13 +39,6 @@ git commit -m "feat(mcp): add calendar sync"
 git push --follow-tags
 ```
 
-### Changelog Filtering
-
-Each component maintains its own `CHANGELOG.md`:
-
-- **MCP Server**: `CHANGELOG.md` (root) - includes `feat(mcp):` and unscoped commits
-- **Helm Chart**: `charts/nextcloud-mcp-server/CHANGELOG.md` - includes `feat(helm):` only
-
 ### Manual Version Bumps
 
 For specific increments:
@@ -82,25 +52,4 @@ uv run cz bump --increment MINOR
 
 # Major bump (0.53.0 → 1.0.0)
 uv run cz bump --increment MAJOR
-
-# For non-MCP components, use --config
-cd charts/nextcloud-mcp-server
-uv run cz --config .cz.toml bump --increment MINOR
 ```
-
-### Versioning Philosophy
-
-- **MCP Server**: Follows PEP 440, `major_version_zero = true` (0.x.x for pre-1.0)
-- **Helm Chart**: Follows PEP 440, starts at 0.53.0 (continues from current)
-
-### Chart.yaml Version vs appVersion
-
-The Helm chart has TWO version fields:
-
-- **`version`**: Chart packaging version (bumped by `feat(helm):`)
-  - Example: `0.53.0` → `0.54.0` when adding resource limits
-
-- **`appVersion`**: MCP server version being deployed (bumped by `feat(mcp):`)
-  - Example: `"0.53.0"` → `"0.54.0"` when MCP server releases
-
-This allows the chart to evolve independently from the application.