Add documentation setup with automated building and publishing to github pages

[jsheunis]

Look into JSdoc; 863e84c already has a single example of a jsdoc-based docstring for a module.

For an html theme, investigate:

• https://github.com/ankitskvmdam/clean-jsdoc-theme
• https://github.com/SoftwareBrothers/better-docs
• https://github.com/clenemt/docdash

[jsheunis]

JSDoc can be used for api documentation.

For general user and developer documentation, I have decided to go with Vitepress, since it's compatible with vuejs 3 and powered by vite tooling which is already used for the build process of this package.

[jsheunis]

With f432d21 to df848e2 we now have a setup for docs that are deployed together with the demo shacl-vue application (at /docs) via github pages.

[jsheunis]

The only step left to figure out is how to use jdoc for api doc generation and then make the resulting pages part of the docs generated by vitepress

Could aim to get a script that runs through vue components, generates markdown from their jsdoc-style comments and docstrings, and then adds those markdown files to the sources for vitepress to build the docs site from.

Look into:

• https://github.com/vue-styleguidist/vue-styleguidist
• https://github.com/antfu/vite-plugin-md