Disable transforming multiple `.`s to elipsis

[luxaritas]

It messes with dot bracket notation

[guyguy2001]

Seems like we either need to move to a different library (which I think is good either way) or disable text replacement altogether to fix this

[luxaritas]

I think it should be possible to just turn this specific replacement off in markdownit - I'm not sure why a different library would be better.

[guyguy2001]

Because markdown-it replaces everything at once, without a rule for each replacement.
We could fork it, but we might want to switch to a vue-based library either way; IDK though.

[luxaritas]

We're talking about using DOMPurify + Marked elsewhere, so it might make sense to switch to Marked for consistency

[luxaritas]

Er, DOMPurify + Marked with DOMPurify set to remove all HTML