[FEATURE] auto-delete styled URLs

[Rockpods]

Describe the bug
You can use markdown to make links look different than they are. This could be a security issue.
Ex: [https://www.google.com](this could link to a phishing page)

To Reproduce
Steps to reproduce the behavior:

1. Go to any room that is bridged.
2. Do the markdown magic(e.g., https://github.com/)

Expected behavior
Graim should delete message or there should be a config option to auto-delete these messages.

[luphoria]

This is actually a pretty good idea. While the markdown filtering is nice, it can be used for phishing. While graim isnt matrix-appservice-discord, it certainly CAN try to auto delete named hyperlinks :)

[luphoria]

Going to merge this with a broader #14 :)