feat: add app code

- journal domain package
- httpserver package
- html templates
- main.go in root dir

httpserver/favicon.go

@@ -0,0 +1,18 @@
+package httpserver
+
+import "net/http"
+
+type Favicon struct {
+	favicon []byte
+}
+
+func NewFavicon(favicon []byte) *Favicon {
+	return &Favicon{
+		favicon: favicon,
+	}
+}
+
+func (f *Favicon) FaviconHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "image/x-icon")
+	w.Write(f.favicon)
+}