Added ability to login

web/templates/login.html

@@ -0,0 +1,8 @@
+{{define "page-content"}}
+<h2>Anmeldung</h2>
+<form>
+    <input name="username" placeholder="Benutzername" type="text" />
+    <input name="password" placeholder="Passwort" type="password" />
+    <input type="submit" value="Anmelden" hx-post="/login/" hx-target="#page-content" />
+</form>
+{{end}}