Migrate docs to MkDocs Material, add assessments command, CLI v0.6.1

Replace monolithic 3,671-line HTML docs with 27-page MkDocs Material site.
Add GitHub Actions workflow for automatic GitHub Pages deployment.
Add assessments CLI command and update connect/monitor/test/campaigns/members commands.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dgerog

.github/workflows/docs.yml

@@ -0,0 +1,17 @@
+name: Deploy docs
+on:
+  push:
+    branches: [main]
+    paths: ['docs/**']
+permissions:
+  contents: write
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - run: pip install mkdocs-material
+      - run: cd docs && mkdocs gh-deploy --force