feat(tags): Allow separating page tags from frontmatter tags

[necauqua]

I feel like tags in note content are just links to the tag page, and shouldn't mark the page with that tag.

Also the way it was done - adding content tags to frontmatter - interferes with my WIP page properties component, I want to only show "explicitly put in the frontmatter" tags.
(I made the frontmatter transformer add a frontmatterRaw copy to the file data to avoid this and a few other issues, so this no longer applies.)

Added an option to have those "outgoing" tags that don't tag the page, yet get a tag page generated (so that the popover is not 404 if there are no pages with this tag).

parseTags: true

parseTags: "link-only"

[necauqua]

I realised that I don't really need this as I can just do wikilinks (so [[tag]] instead of #tag) in my content, which works even better in Obsidian.

But I still think this is a good option to have.

Amended a tiny fix to not slugify tag text in the generated links - again, something that will be an issue with lowercase slugs. eh will move to a separate PR, also it turned out a bit bigger than a oneline fix lol