Add config file and rework cli parsing and passing of config values (#263)

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/263
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: crapStone <me@crapstone.dev>
Co-committed-by: crapStone <me@crapstone.dev>

server/cache/interface.go

@@ -2,7 +2,8 @@ package cache
 
 import "time"
 
-type SetGetKey interface {
+// ICache is an interface that defines how the pages server interacts with the cache.
+type ICache interface {
 	Set(key string, value interface{}, ttl time.Duration) error
 	Get(key string) (interface{}, bool)
 	Remove(key string)

server/cache/memory.go

@@ -2,6 +2,6 @@ package cache
 
 import "github.com/OrlovEvgeny/go-mcache"
 
-func NewKeyValueCache() SetGetKey {
+func NewInMemoryCache() ICache {
 	return mcache.New()
 }