Add docs for deploying to DigitalOcean App Platform

[LoriKarikari]

I have created some documentation on how to deploy to DigitalOcean App Platform. I'm going to reread it and fix some stuff when needed so I'm leaving it as a draft for now.

Some notes:

• the build command I had to use is npx blitz db migrate && npx blitz build because otherwise, it throws an error that the command is not found. I tried adding a PATH variable and I was able to use the blitz command but the run command would fail so I left it out.
• the run command is npx next start because I was encountering the same issue as seen with Heroku where Blitz rebuilds. This is because some files are added during the build. I haven't figured out yet which files so this has to do for now.

Closes #240

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[flybayer]

Yeah on CI you need to run npm run blitz start, yarn blitz start, or npx blitz start since blitz isn't installed globally. Or use package.json scripts

[flybayer]

Hey @LoriKarikari were you finished with this? (Still marked as Draft)

[LoriKarikari]

Hey @LoriKarikari were you finished with this? (Still marked as Draft)

Hi, I think some things changed since I created this because App Platform is fairly new. I'm not using it anymore since it didn't suit my needs so I forgot about it, sorry for that. I'll check if something has changed and remove the draft.