add subscribing and unsubscribing, add post editing

app/templates/posts/edit.html

@@ -0,0 +1,24 @@
+{%- from 'common/macros.html' import full_post with context -%}
+{%- extends 'base.html' -%}
+{%- block title -%}editing a post{%- endblock -%}
+{%- block content -%}
+  {%- for post in context_prev -%}
+  <div class="post plank">{{- full_post(post=post, show_toolbar=false, show_reactions=false) -}}</div>
+  {%- endfor -%}
+  <div class="plank secondary-bg context-explain">
+    <span>&uarr;&uarr;&uarr;</span>
+    <i>Context</i>
+    <span>&uarr;&uarr;&uarr;</span>
+  </div>
+  <form class="post plank" method="POST">
+  {{- full_post(post=post, is_editing=true, show_toolbar=false, show_reactions=false) -}}
+  </form>
+  <div class="plank secondary-bg context-explain">
+    <span>&darr;&darr;&darr;</span>
+    <i>Context</i>
+    <span>&darr;&darr;&darr;</span>
+  </div>
+  {%- for post in context_next -%}
+  <div class="post plank">{{- full_post(post=post, show_toolbar=false, show_reactions=false) -}}</div>
+  {%- endfor -%}
+{%- endblock -%}