feat(web/converse): Import repository

Imports the converse forum software I wrote a few years ago. I want to
clean this up a bit and try using Hotwire with it.

Note: The original repository was AGPL-3.0 licensed. I'm the copyright
holder and have relicensed it to GPL-3.0 in the commit that is being
merged.

Imported from: https://github.com/tazjin/converse

git-subtree-dir: web/converse
git-subtree-mainline: 386afdc794
git-subtree-split: 09168021e7
Change-Id: Ia8b587db5174ef5b3c52910d3d027199150c58e0

web/converse/static/styles.css

@@ -0,0 +1,145 @@
+* :not(.material-icons) {
+  font-family: 'Ubuntu', sans-serif;
+}
+
+code, pre, code * {
+    font-family: 'Ubuntu Mono', monospace !important;
+}
+
+.cvs-title, .thread-link {
+    text-decoration: none;
+}
+
+.thread-list-item:hover {
+    background-color: #f5f5f5;
+}
+
+.thread-link {
+    padding: 5px;
+    padding-top: 10px;
+}
+
+.thread-title {
+    padding-right: 15vw;
+}
+
+.search-field {
+    margin-right: 15px;
+    max-width: 200px;
+}
+
+.thread-author {
+    font-style: italic;
+    font-size: 85%;
+}
+
+@media only screen and (min-width: 768px) {
+    .converse main {
+        padding-top: 10px;
+        padding-bottom: 10px;
+    }
+}
+
+.mdl-list__item-text-body {
+    max-height: 40px;
+}
+
+.thread-divider:after {
+    border-bottom: 1px solid rgba(0,0,0,.13);
+    content:"";
+    position: absolute;
+    width: 80%;
+}
+
+html, body {
+  margin: 0;
+  padding: 0;
+}
+.converse .mdl-layout__header-row {
+  padding-left: 40px;
+}
+.converse .mdl-layout.is-small-screen .mdl-layout__header-row h3 {
+  font-size: inherit;
+}
+.converse .mdl-card {
+  height: auto;
+  display: -webkit-flex;
+  display: -ms-flexbox;
+  display: flex;
+  -webkit-flex-direction: column;
+      -ms-flex-direction: column;
+          flex-direction: column;
+}
+.converse .mdl-card > * {
+  height: auto;
+}
+.converse .mdl-card .mdl-card__supporting-text {
+  margin: 40px;
+  -webkit-flex-grow: 1;
+      -ms-flex-positive: 1;
+          flex-grow: 1;
+  padding: 0;
+  color: inherit;
+  width: calc(100% - 80px);
+}
+.mdl-demo.converse .mdl-card__supporting-text h4 {
+  margin-top: 0;
+  margin-bottom: 20px;
+}
+.converse .mdl-card__actions {
+  margin: 0;
+  padding: 4px 40px;
+  color: inherit;
+}
+.converse section.section--center {
+  max-width: 860px;
+}
+.converse .mdl-card .avatar-card {
+    display: flex;
+    flex-direction: column;
+    text-align: center;
+    margin-top: 30px;
+}
+.desktop-avatar {
+    width: 80px;
+    margin-right: auto;
+    margin-left: auto;
+}
+.mobile-avatar {
+    width: 30px;
+    border-radius: 8px;
+    margin-bottom: 5px;
+}
+.mobile-date {
+    text-decoration: none;
+}
+.converse .mdl-card .post-box {
+    margin: 20px;
+}
+.converse .mdl-card .post-actions {
+    display: flex;
+    padding-right: 5px;
+}
+.post-action {
+    margin: 5px;
+    margin-bottom: 10px;
+}
+.converse section.post-section {
+    padding: 5px;
+}
+.post-date {
+    text-decoration: none;
+    font-size: 80%;
+}
+.mdl-layout__content {
+    flex: 1 0 auto;
+}
+.converse .reply-box {
+    padding-top: 10px;
+}
+.search-result {
+    margin: 8px;
+}
+.search-result .mdl-button {
+    margin: 3px;
+}