Markdown rendering for Matrix notifications

[MTRNord]

Hi,

Initially I wanted to fix this myself, but it seems a little harder than initially expected.
Basically, notifications currently are rendered like this:

Which looks like raw markdown.
It would be nice to instead have them look like this:

This seems a lot more readable to me.
I hope this makes sense and could be worked on :)

For context, the JSON event of the formatted version looks like this:

{
  "type": "m.room.message",
  "content": {
    "msgtype": "m.text",
    "body": "💫 **kustomization/infra-notifications.flux-system**\n\nReconciliation finished in **117.422276ms**, next run in **1h0m0s**\n\n- **commit\\_status:** `update`\n- **revision:** `main@sha1:f021a600b031253be81b2ab58ed0d37271b74ead`\n- **summary:** `production cluster`",
    "format": "org.matrix.custom.html",
    "formatted_body": "<p>💫 <strong>kustomization/infra-notifications.flux-system</strong></p>\n<p>Reconciliation finished in <strong>117.422276ms</strong>, next run in <strong>1h0m0s</strong></p>\n<ul>\n<li><strong>commit_status:</strong> <code>update</code></li>\n<li><strong>revision:</strong> <code>main@sha1:f021a600b031253be81b2ab58ed0d37271b74ead</code></li>\n<li><strong>summary:</strong> <code>production cluster</code></li>\n</ul>\n"
}

The most important changes are that there is an additional formatted_body which needs to be HTML and there is "format": "org.matrix.custom.html" indicating that this is a formatted message.

[darkowlzz]

Hi, I think that'd be great.
Found https://github.com/gomarkdown/markdown to be useful for converting markdown to html easily.