mostly implement topics app

app/templates/topics/edit.html

@@ -0,0 +1,16 @@
+{% extends "base.html" %}
+{% block title %}creating a topic{% endblock %}
+{% block content %}
+<div class="darkbg settings-container">
+  <h1>Editing topic {{ topic['name'] }}</h1>
+  <form method="post">
+    <label for=name>Name</label>
+    <input type="text" name="name" id="name" required value="{{ topic['name'] }}"><br>
+    <label for="description">Description</label>
+    <textarea id="description" name="description" required rows=5>{{ topic['description'] }}</textarea><br>
+    <input type="submit" value="Save changes">
+    <a class="linkbutton warn" href={{ url_for("topics.topic", slug=topic['slug'] )}}>Cancel</a><br>
+    <i> Note: to preserve history, you cannot change the topic URL.</i>
+  </form>
+</div>
+{% endblock %}