Split "Getting Started" into sections for use in webcomponents and regular SPAs

[devtobi]

Is your feature request related to a problem? Please describe.
Main purpose of muc-patternlab-vue will be the use while developing web components.
However I think its good to provide documentation for both the SPA and the web component case.

Describe the solution you'd like
I suggest to split the page into a "General" section that always applies, as well as "SPA" and "Web Component" specific parts. (Maybe by using subsections or completely separate pages, depends on amount of content)

For the "Web Component" section I suggest adding a note, that vite-plugin-css-injected-by-js is required to make muc-patternlab-vue work in those scenarios.

Describe alternatives you've considered

Additional context