[TRI-886] Update "Create an integration" docs for monorepo with tsconfig paths

[matt-aitken]

When creating an integration inside the Trigger.dev monorepo (this repo) you need to add some paths to the tsconfig. Like this: https://github.com/triggerdotdev/trigger.dev/blob/main/integrations/resend/tsconfig.json

We should add this to our docs page: https://github.com/triggerdotdev/trigger.dev/blob/main/docs/integrations/create.mdx

_{From SyncLinear.com | TRI-886}

[kaf-lamed-beyt]

I'd love to work on this @matt-aitken.

[kaf-lamed-beyt]

Oops! I noticed that you're already taking this up.

[Smartmind12]

Hey @matt-aitken Is addition of path just for tsconfig or do we add it for tsup.config.ts as well?

[nicktrn]

Should become redundant with #627, might want to close this.