Summary
- proper Presentation.Entity_Context for hyperlinks (amending da1108a6d249);
- clarified symbolic path;
- clarified extension name (again);
- removed obsolete material;
- update scripts, based on recent "yo code" template;
- clarified extension name (again), corresponding to qualified resources within VSCode (settings, commands, etc.);
- clarified signature;
- clarified extension name;
- clarified signature;
- clarified signature;
- clarified options;
- support local .vsix installation; discontinued publishing to VSCode Marketplace, which will become obsolete eventually;
- formal record of generated package-lock.json;
- pro-forma update of version, for ongoing development;
- updated notes on Isabelle/VSCode development;
- proper engines.vscode (amending c04ccea8bdd2): required for "vsce package", e.g. via "isabelle build_vscode;