TL;DR
Store bot content of roboports in blueprints ( similar to train fuel or modules ) and make construction bots carry them to the roboport.What ?
Automate delivery of first bots.When creating a blueprint containing a roboport, there should be a checkbox in the 'Filters' block to "include bots from roboport" or "include 1 logistic/construction bot", and when checked, constructions bots should carry the initial bots to this roboport.
Why ?
The construction area of the roboport is larger then the logistic supply area, this makes it possible to build a roboport that is disconnected from the logistic network. There is no (good) way of delivering bots to this roboport:- It can be done with a belt across the roboport's logistic area, which is not a good solution in bot-only bases
- Or it can be done manually, which is not a good solution in Factorio.