Add markdown enhancements on export

[CePeU]

I am currently looking into how to make an easy build process for publishing my obsidian notes to github (so you will get 3 enhancement proposals).

As markdown is not a structured and clearly defined format it would be nice if one could add a list of regex commands which touch and change the exported markdown.

For example I would need code blocks to contain an additional "markdown" tag/command on export which Obsidian does not have or which is implemented by another plugin but has a different name.

Example:
An Obsidian Plugin offers to change and show the line numbering of code blocks.
regular: ´´´python
plugin: ´´´python ln:1
export: ´´´python linenums="1"

With a regex I could change either ´´´python or ´´´python ln:1 to the desired ´´´python linenums="1"

[CePeU]

I did a VERY rudimentary regex enhancement.
I tried to implement an enhancement so one string can be replaced before export. I did my changes in javascript directly and it seems to work. I have little experience and no toolchain for Typescript. I am not very profficient yet with github. How can I branch the code/give it to you as a pull request for inspeciton? (As I hopefully transfered the code correctly)