Many issues in the wiki were unnecessarily links:
```
... patch posted in [\#1346](#1346).
```
This rewrites these as `#1346` using
```bash
sed -i -r -e 's/\[\\#([0-9]+)\]\([^)]+\/\1\)/#\1/g' $(find -iname '*.md')
```
And manually eyeballing the result.

lambdas-vs-pattern-matching.md

 
-This page is a summary of proposals from [\#4359](https://gitlab.haskell.org/ghc/ghc/issues/4359)
+This page is a summary of proposals from #4359
 
 ## The problem