[FEATURE] allow seeing .md files in commit records in copado

[JoernBerkefeld]

idea is that we dont just see name, key, type and path but can also have a sneak peek at the content.

maybe adding a markdown rendering plugin for salesforce could also be really beneficial here, if that exists.

this was a request from our pilot client but it would seriously increase UX.
One could even consider showing it on the retrieve page but that would require a lot more time each time we refresh...

[JoernBerkefeld]

maybe sth like this? https://github.com/jsmithdev/lightndown