## Issue
4797: Markdown preview breaks when using a lbry link in angle brackets
This is similar to the Embed case in commit dbcd677e.
## Change
Replaced it with a dummy link that looks like what the final outcome would be, but would not be clickable.
Again, similar to the embed case, unless there is a way to pass the store over, I don't have an alternative that makes sense: Adding a dummy router or replacing it as a regular <a> will just make React spew security errors.
Not being able to click it is not ideal as we (as a user) can't verify our links, but it's better than the current case of not rendering anything at all.
## Issue
4644: Markdown Preview breaks when <iframe> is present
Error: "Invariant violation: could not find 'store' ..."
## Change
Until we figure out a way to pass the store to the SimpleMDE preview formatter, just replace the embed with a stub region.
