docs: restore watch and drop the stale banner env

Zensical natively supports the watch key; dropping it broke serve
live-reload for docs_src/ snippet edits. The deploy-docs banner env only
applied to mkdocs-material builds, and the v1.x fallback arm already sets
it inline.

Author: maxisbey

.github/workflows/deploy-docs.yml

@@ -50,9 +50,6 @@ jobs:
 
       - name: Build combined docs (v1.x at /, main at /v2/)
         run: bash scripts/build-docs.sh site
-        env:
-          # Silence mkdocs-material's MkDocs 2.0 warning banner in CI logs.
-          NO_MKDOCS_2_WARNING: "1"
 
       - name: Configure Pages
         uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0

mkdocs.yml

@@ -164,6 +164,13 @@ markdown_extensions:
       custom_checkbox: true
   - sane_lists # this means you can start a list from any number
 
+# Zensical natively watches these beyond docs/: page content is assembled
+# from src/ (mkdocstrings) and docs_src/ (snippet includes), so serve
+# live-reload must react to both.
+watch:
+  - src
+  - docs_src
+
 # Zensical natively re-implements `search`, `glightbox` and `mkdocstrings`; it
 # does not run arbitrary MkDocs plugins or hooks. The former `gen-files`,
 # `literate-nav` and `llms_txt` hook are handled by the standalone scripts