feat: replace config system with viper based system

allows for config settings to be easily set through ENV variables,
config files, or CLI flags

adds flag to run migration on web server start (fixes #29)

internal/graph/graph.go

@@ -16,17 +16,15 @@ import (
 	"github.com/99designs/gqlgen/graphql/playground"
 	"github.com/google/uuid"
 	"github.com/jordanknott/taskcafe/internal/auth"
-	"github.com/jordanknott/taskcafe/internal/config"
 	"github.com/jordanknott/taskcafe/internal/db"
 	log "github.com/sirupsen/logrus"
 	"github.com/vektah/gqlparser/v2/gqlerror"
 )
 
 // NewHandler returns a new graphql endpoint handler.
-func NewHandler(config config.AppConfig, repo db.Repository) http.Handler {
+func NewHandler(repo db.Repository) http.Handler {
 	c := Config{
 		Resolvers: &Resolver{
-			Config:     config,
 			Repository: repo,
 		},
 	}

internal/graph/resolver.go

@@ -5,12 +5,10 @@ package graph
 import (
 	"sync"
 
-	"github.com/jordanknott/taskcafe/internal/config"
 	"github.com/jordanknott/taskcafe/internal/db"
 )
 
 type Resolver struct {
-	Config     config.AppConfig
 	Repository db.Repository
 	mu         sync.Mutex
 }