add subscribing and unsubscribing, add post editing

data/static/css/style.css

@@ -182,7 +182,7 @@ button, .linkbutton, input[type="submit"] {
 }
 
 .tab-content {
-
+  min-height: 250px;
 
   &.hidden {
     display: none;
@@ -192,7 +192,7 @@ button, .linkbutton, input[type="submit"] {
 
 .babycode-editor {
   width: 100%;
-  height: 150px;
+  min-height: 150px;
 }
 
 .post-edit-form {
@@ -620,6 +620,11 @@ form.full-width {
   }
 }
 
+.context-explain {
+  display: flex;
+  justify-content: space-evenly;
+}
+
 /* babycode tags */
 .inline-code {
   background-color: var(--code-bg-color);