I use a combination of netbox for the physical/logical network and server connectivity, and outline for text documentation of the different components.

This may be overkill for most use cases but you can use jcr.

The best reason to use it in my book is the garbage collection as the official registry doesn't have that feature and can and will bloat over time.

You should look into GrapheneOS if you're set on using pixel.

Looks good and I was able to get it on pretty quickly. I was about to post this from the app but saw it's missing the web's markdown shortcuts and image upload option.

Also looking at this post the screenshots are cropped and I didn't see a straight forward way of looking at the whole image.

You may want to give this a quick read before using signal

https://dessalines.github.io/essays/why_not_signal.html

I personally haven't verified the claims on there but I've been using a personal instance of Matrix for a while now and it's been working great.