Theme update (#553)

* Start to update the theme

- Ligther colors
- No more border radius
- Buttons are now always colored
- Start to redesign the post page (according to the Figma mockups)

* Fix build script: it now recompiles everytime a scss file changed

* Make sure the article illustrations are not too big

* Make articles wider (70 characters)

* Better contrast between gray shades

* Various improvements

* Better mobile style

* New style for the footer

* Improve comment style

* Better responsiveness again

* Limit the size of the article cover

* Last details?

- Improve buttons on the media page
- Improve lists

* Pin the stdweb version that we use

It changed because I removed Cargo.lock to handle a merge conflict

I could have updated cargo web too, but it mean I should have re-built
the CI docker image and it was taking forever.

* Better contrast for links in the header of the article

* Add a basic privacy policy

* Remove "also"

* Fix a few issues

- Don't watch static/css in build.rs
- Another shade of white
- Remove useless margin rule for error messages

templates/medias/details.rs.html

@@ -24,15 +24,17 @@
             </p>
             <code>@media.markdown().unwrap_or_else(|_| SafeString::new(""))</code>
         </div>
-        <div>
-	    @if media.category() == MediaCategory::Image {
-                <form class="inline" method="post" action="@uri!(medias::set_avatar: id = media.id)">
-		    <input class="button" type="submit" value="@i18n!(ctx.1, "Use as an avatar")">
-                </form>
-	    }
-            <form class="inline" method="post" action="@uri!(medias::delete: id = media.id)">
-                <input class="button" type="submit" value="@i18n!(ctx.1, "Delete")">
+    </section>
+
+    <section>
+        @if media.category() == MediaCategory::Image {
+            <form method="post" action="@uri!(medias::set_avatar: id = media.id)">
+                <input class="button" type="submit" value="@i18n!(ctx.1, "Use as an avatar")">
             </form>
-        </div>
+        }
+
+        <form method="post" action="@uri!(medias::delete: id = media.id)">
+            <input class="button destructive" type="submit" value="@i18n!(ctx.1, "Delete")">
+        </form>
     </section>
 })