feat(api): create session on register

feat(api): increase session lifetime to 30 days

feat(api): logout endpoint

feat(api): session validation

feat(api): login password verification

WIP(api): session management

fix(api): /ping -> /api/ping

docs: small doc updates

feat(api): init redis session backend

chore(api): add actix-session dep

chore(api): format Cargo.toml

fix(api): update dev-launch.sh with redis url in wanted format

fix(api): update dev-launch.sh with valid cookie signing key

feat(api): add redis configuration to docker-compose.dev.yaml

chore(api): update dev scripts

fix(api): check if user exists before hashing password on registration

feat(api): reimpl user registration

fix(api): skip user model password field

fix(api): avoid duplicate user details at the db level

fix(api): NewUser -> InsertableUser