change: clean leading quote from notification message

[singularity-s0]

This PR modifies the content of notifications description to remove the quote at the beginning. It makes notification previews easier to read.

Please review carefully since I'm not familiar with the language.

[ppolariss]

Great idea, but there are a few issues to address:

1. Remove the ^ in the floor regex. Otherwise, when processing strings like ##456\n##123\nfoo, it will retain ##123\nfoo.
2. Add regex support for matching holes (#num).
3. Have you considered removing newline characters(\n) using regex?
4. I'm not sure what will happen if the description is empty after removal. Some push mechanisms might encounter issues. I suggest returning the original content if the match results in an empty string.
5. It would be better to apply this function once at the following location in the code: [notification.go (L156-L159)].

[singularity-s0]

Closing this PR in favor of #168