Fix Markdown Linter Size Limitation

[jag3773]

Interesting error on this project project in the Warning dialog, https://door43.org/u/Door43-Catalog/kn_tw/78e6e5f40f/ , I ran it again on the dev pipeline and got the same thing https://dev.door43.org/u/Door43-Catalog/kn_tw/78e6e5f40f/ .

Apparently it's because the payload is over 6MB, see https://docs.aws.amazon.com/lambda/latest/dg/limits.html and maybe https://stackoverflow.com/questions/52599721/maximum-size-of-payload-for-an-aws-lambda-request-event

I'm thinking that we should be able to pass a URL to the linter and have it fetch and lint it all on its own.
Especially if we already have the file available on an S3 bucket it would make a lot of sense to do it that way. Maybe this is only a valid solution for the Lambda linter, which would be ok. Further investigation should be done before diving into this idea.