Easier typescript support for bun documentation

[Autumnlight02]

I found out the following: If you want to run these migrations with bun you can simply do as an example:

bunx --bun node-pg-migrate down

as an example. the --bun flag will force the bun runtime, which allows it to execute typescript files. You can use this instead of ts-node. Maybe this can be added to the docs?

[Shinigami92]

I personally have nothing to do with bun, but feel free to enhance the docs via a PR and I can review.