Allow to run on local machine with all features.

[pluja]

Right now, it is needed to have an Nginx server to use Yotter although it is already prepared to not need it (it is much better with Nginx!).

So I want to modify the code so when the option isInstance on the config is set to False it can be run on a local machine without needing a nginx server.

[FireMasterK]

Can we remove the proxying endpoints and add new ones that perform like how Nginx currently does? This would potentially remove the need for any configuration options too.

[pluja]

Sure, this is the most clever way to do it 🤔😁

[lowne]

#116 solves this, at least for YT (see #119)