docs: Add community guide for integrating the Mealie-Bring-API

[felixschndr]

What this PR does / why we need it:

See #3627 (reply in thread)

Special notes for your reviewer:

I was not sure whether there is some crucial information missing. I din't want to add to many details as all the information is described in the repository the docs link to and I didn't want to add any unnecessary duplication. Do you think anything shall be added?

[michael-genson]

Placement looks good, can you elaborate more on the specific use-case isn't resolved by #4676? That PR will make it so Mealie doesn't have to be publicly accessible to use the Bring integration, but it does need to be exposed to the internet (whereas, if I understand correctly, your integration allows Mealie to stay locked behind local network access only)

Otherwise I agree, no need to duplicate docs when you link to the project. Maybe a quick "check out the project for installation instructions" or something similar, just to clarify that you won't find them in the Mealie docs.

[felixschndr]

That PR will make it so Mealie doesn't have to be publicly accessible to use the Bring integration, but it does need to be exposed to the internet

Can you please explain what you mean by that? Does that mean Mealie has to be exposed to the internet and the recipe can be shared even though it normally would require a user login?

whereas, if I understand correctly, your integration allows Mealie to stay locked behind local network access only

exactly, no service has to be exposed to the internet at all. I will add a comment to make this clearer in the docs (edit: done in d369cab)

[michael-genson]

Thank you!!

Does that mean Mealie has to be exposed to the internet and the recipe can be shared even though it normally would require a user login?

Yup, that's right. Once that PR is merged Mealie will still need to be exposed to the internet, however it won't require a login for the Bring integration (and similar usecases). Your web server adds an extra layer of protection though since it doesn't require Mealie to have external access