Markdown editor should be swappable

[csharpfritz]

If users would like a different markdown editor, they should be able to swap in a component that supports their needs

[csharpfritz]

We have a TextEditor component that should be used as the abstraction layer between the editor and Blazor pages of SharpSite.Web

[bsimser]

Should the entire editor be swappable? I think something like github or wiki.js might be good where you can write markdown extensions instead? Or would that be a totally different feature. Specifically I'm thinking like markdown that supports mermaid or plantUML.