this entails a couple of breaking changes due to schema evolution. once
the schema is stabilised, backward compatibility promise will be given.
* update config struct and accompanying scructs
* update tests
* update exampleConfig.dhall
* update local dev environment (devenv)
* make settings reflect the config schema changes
* make use of some settings/config updates
* add Email field to User entity (+codegen)
* switch to Echo contrib sessions backed by Gorilla sessions
* use SessionCookieSecret value from the config
* stage mod,sum changes
* add clearer signup/signin redirect logic
* render error pages on 500/404s and only fall back to returning raw
errors when the error is some unexpected kind
* add username/email "exists" funcs+tests - handle "not found" and "not
unique" errors, return errors otherwise
* add handlers for signin,singup,logout...
* introduce ent ORM and add user schema
* add live mode, devel mode to selectively turn on features via
config/flags
* add templates, handle embedding moar smarter:
* live mode uses live folder structure, else embedded templates are
used
* start using tailwindcss to style stuff
* add development goodies for hot-reloading (browser-sync - bs.js)
* pimp-up config.dhall with actual custom config Type (enables remote
schema and local values only as needed)
* add justfile (alternative to makefile for process automation)
