chore: fix netlify docs deploy (gnolang#1564)

This PR force netlify to deploy when there is update on the folder docs/
and misc/docusaurus only.

Fixes gnolang#1532

<details><summary>Contributors' checklist...</summary>

- [ ] Added new tests, or not needed, or not feasible
- [ ] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [ ] Updated the official documentation or not needed
- [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

netlify.toml

@@ -0,0 +1,45 @@
+
+# Settings in the [build] context are global and are applied to
+# all contexts unless otherwise overridden by more specific contexts.
+[build]
+  # Directory where the build system installs dependencies
+  # and runs your build. Store your package.json, .nvmrc, etc here.
+  # If not set, defaults to the root directory.
+  base = "misc/docusaurus"
+
+  # Directory that contains the deploy-ready HTML files and
+  # assets generated by the build. This is an absolute path relative
+  # to the base directory, which is the root by default (/).
+  # This sample publishes the directory located at the absolute
+  # path "root/project/build-output"
+
+  publish = "build"
+
+  # Default build command.
+  command = "yarn build && yarn install"
+
+  ignore = "git diff --quiet $COMMIT_REF $CACHED_COMMIT_REF -- . ../../docs ../../netlify.toml"
+
+[[plugins]]
+  # Installs the Lighthouse Build Plugin for all deploy contexts
+  package = "@netlify/plugin-lighthouse"
+
+# [[headers]]
+#   # Define which paths this specific [[headers]] block will cover.
+#   for = "/*"
+
+#   [headers.values]
+#     X-Frame-Options = "DENY"
+#     X-XSS-Protection = "1; mode=block"
+#     Content-Security-Policy = "frame-ancestors https://www.facebook.com"
+
+#     # Multi-value headers are expressed with multi-line strings.
+#   cache-control = '''
+#   max-age=0,
+#   no-cache,
+#   no-store,
+#   must-revalidate'''
+
+#     # Basic-Auth allows you to password protect your whole site.
+#     # This feature may not be available on all plans.
+#     Basic-Auth = "someuser:somepassword anotheruser:anotherpassword"