upgrade workflow to node 14

mermaid dep bump

pinned parcel-bundler

mermaid fenced metadata in structured field values format (fixes #107)

upgrade mermaid

fixed version

removed `lodash` dependency

switched from using hardcoded `vscode-resource` scheme to `Webview.as…

…WebviewUri` (fixes #101)

updated mermaid version

fixed the fixed azure devops regex