feature: basic auth0 support (#78)

* feature: basic auth0 support

* refactor: improve auth flow

* refactor: extract HttpServer config

* feature: merge HTTP API layer with Let's Encrypt

management/http_server/template/templates.go

@@ -0,0 +1,21 @@
+package template
+
+import (
+	"html/template"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func RenderTemplate(w http.ResponseWriter, tmpl string, data interface{}) {
+	cwd, _ := os.Getwd()
+	t, err := template.ParseFiles(filepath.Join(cwd, "./routes/"+tmpl+"/"+tmpl+".html"))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	err = t.Execute(w, data)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}