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/memory.go

@@ -0,0 +1,7 @@
+package cache
+
+import "github.com/OrlovEvgeny/go-mcache"
+
+func NewInMemoryCache() ICache {
+	return mcache.New()
+}