Add dev server functionality based on docsify

[ntrogh]

Add a local documentation preview workflow using Docsify. The changes make it easier for contributors to preview and navigate the documentation site locally.

The website does not exactly match the production website in terms of style, but enables previewing content changes and verifying cross-linking.

To preview docs locally, run the following command in the terminal:

npm install
npm run serve

[Copilot]

Pull request overview

Adds a Docsify-based local preview workflow for this docs repo, intended to help contributors browse content locally with navigation/search and validate links.

Changes:

• Add Docsify dev server (npm run serve) and dependency on docsify-cli.
• Add a generated multi-section sidebar workflow (build/generate-sidebar.js) and supporting navbar/landing READMEs.
• Ignore generated sidebar files in .gitignore.

Reviewed changes

Copilot reviewed 7 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
package.json	Adds generate-sidebar and serve scripts; adds docsify-cli dev dependency.
package-lock.json	Locks the new docsify-cli dependency tree.
index.html	Introduces the Docsify app shell/config, including sidebar/navbar config, search, and custom plugins.
build/generate-sidebar.js	Generates _sidebar*.md files from existing TOC JSON and frontmatter metadata.
_navbar.md	Adds top-level navbar links for Docs/API/Blogs/Release Notes.
blogs/README.md	Adds a landing page for the /blogs/ route.
release-notes/README.md	Adds a landing page for the /release-notes/ route.
CONTRIBUTING.md	Documents how to run the local Docsify preview.
.gitignore	Ignores generated sidebar markdown files.
.nojekyll	Adds .nojekyll marker file (empty).

Comments suppressed due to low confidence (2)

index.html:221

• Docsify scripts are loaded from jsDelivr using unpinned versions ("docsify@4") and without subresource integrity. For reproducibility/supply-chain safety, prefer pinning exact versions and adding integrity/crossorigin (or vendoring locally).

  <script src="https://cdn.jsdelivr.net/npm/docsify@4/lib/docsify.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/docsify@4/lib/plugins/search.min.js"></script>
</body>

index.html:135

• The folder toggle click handler always calls preventDefault(). If the toggle element is an anchor, this will block normal navigation. Consider only preventing default for non-anchor toggles, or checking for an href before preventing navigation.

                toggle.addEventListener('click', function (e) {
                  e.preventDefault();
                  e.stopPropagation();
                  this.parentElement.classList.toggle('open');

[ntrogh]

@rzhao271 Added support for hosting the vscode-docs locally for contributors. It's not full fidelity but enables reviewing content without access to the website infra project.