Reorganized API + added db migrations

Read the README file for more informations

backend/api/shortcodes/shortcodes.go

@@ -0,0 +1,26 @@
+package shortcodes
+
+import (
+	"context"
+	"net/http"
+
+	"fr.latosa-escrima/api/core"
+)
+
+func HandleShortcodes(w http.ResponseWriter, r *http.Request) {
+	var shortcodes []core.Shortcode
+	err := core.DB.NewSelect().Model(&shortcodes).Scan(context.Background())
+	if err != nil {
+		core.JSONError{
+			Status:  core.Error,
+			Message: err.Error(),
+		}.Respond(w, http.StatusInternalServerError)
+		return
+	}
+
+	core.JSONSuccess{
+		Status:  core.Success,
+		Message: "Shortcodes retrieved.",
+		Data:    shortcodes,
+	}.Respond(w, http.StatusOK)
+}