Remove all old & obsolete remark-wiki-link or flowershow related issues

[rufuspollock]

We have a bunch of bugs etc that are obsolete/out of date relating to https://github.com/flowershow/remark-wiki-link and https://github.com/flowershow/flowershow (when their codebase was more part of this repo).

Acceptance

• All such issues remove

Tasks

• Review old issues especially in bugs and remove them if obsolete