* Add initial api docs using drf-spectacular
This commit adds the inital and basic docs using drf-spectacular.
It also adds some serializers to be used for automatically
generating response objects by drf-spectacular
* Update api docs with correct request and response objects
- TODO: /order route
* Fix typo in api docs
* Separate OpenAPI schemas into it's own file
* Update drf-spectacular and add API intro and logo
* Update API docs for GET /order
* Add api docs for POST /order route
* Update serializers.py
* Add stealth invoice switch to profile
* Add stealth invoice including only order uuid
* Add explanatory tooltip for stealth invoices and fix code smells
Endpoint request contains a token. Server checks whether it has enough entropy to be secure (at least 128 bits and >0.7 shannon heterogeneity). Server hashes the token (once as of now) and derives nickname and robohash avatar (goes into static/assets/avatars). Nickname is limited to only adjectives, nouns and 3 digits, restricted to 18 characters long max. The corpus of nicknames is 20 billion big (maybe not enough? nick collision chance can happen, but server will just reply with 400 unless the token matches perfectly too)
Added the Order model with a rough approxiation to the fields needed. The field status can be read lineally as the progression trough the app pipeline. The view serves POSTs requests to enter new orders into the db.
