feat(fastapi): add /pkgbase/{name}/comments/{id}/edit (get)

This is needed so that users can edit comments when they don't have
Javascript being used in their browser.

Signed-off-by: Kevin Morris <kevr@0cost.org>

templates/packages/comments/edit.html

@@ -0,0 +1,44 @@
+{% extends "partials/layout.html" %}
+
+{% block pageContent %}
+    <div class="box">
+        <h2>{{ "Edit comment for: %s" | tr | format(comment.PackageBase.Name) }}</h2>
+
+        <form action="/pkgbase/{{ comment.PackageBase.Name }}/comments/{{ comment.ID }}"
+              method="post">
+            <fieldset>
+                <div>
+                    <input type="hidden" name="next" value="{{ next }}" />
+                </div>
+
+                <p>
+                    {{
+                        "Git commit identifiers referencing commits in "
+                        "the AUR package repository and URLs are converted "
+                        "to links automatically." | tr
+                    }}
+                    {{
+                        "%sMarkdown syntax%s is partiaully supported."
+                        | tr | format(
+                            '<a href="https://daringfireball.net/projects/markdown/syntax">',
+                            "</a>"
+                        ) | safe
+                    }}
+                </p>
+
+                <p>
+                    <textarea id="id_comment"
+                              name="comment"
+                              cols="80"
+                              rows="10">{{ comment.Comments }}</textarea>
+                </p>
+
+                <p>
+                    <input type="submit" value="{{ 'Save' | tr }}" />
+                </p>
+
+            </fieldset>
+        </form>
+
+    </div>
+{% endblock %}