vscode-markdown-languageserver

Server capabilities
* Completions for Markdown links.
* Folding of Markdown regions, block elements, and header sections.
* Smart selection for inline elements, block elements, and header sections.
* Document Symbols for quick navigation to headers in a document.
* Workspace Symbols for quick navigation to headers in the workspace
* Document links for making Markdown links in a document clickable.
* Find all references to headers and links across all Markdown files in the workspace.
* Rename of headers and links across all Markdown files in the workspace.
* Go to definition from links to headers or link definitions.
* (experimental) Pull diagnostics (validation) for links.