Add support for contents of Libervia (XEP-0277);

Various of visual improvements.

css/stylesheet.css

@@ -191,6 +191,7 @@ h3.title > a {
 #articles div.entry span.tags {
   display: inline-flex;
   /* display: ruby; */
+  flex-wrap: wrap;
 }
 
 #articles div.entry span.tags > div {
@@ -271,16 +272,20 @@ h3.title > a {
   margin:3px;
 }
 
-#note {
+#note, #small {
   line-height: 30px;
   margin: auto;
   margin-top: 0.67em;
-  max-width: 70%;
+  max-width: 80%;
   padding: 10px;
   text-align: center;
   user-select: none;
 }
 
+#small {
+  font-size: 80%;
+}
+
 @media (max-width: 1550px) {
   #articles {
     display: unset;