Add swarm guide to /docs (#1513)

* docs: add swarm-guide

* readthedocs build configuration file

docs/swarm-guide/contents/_static/theme_overrides.css

@@ -0,0 +1,32 @@
+/* override table width restrictions */
+@media screen and (min-width: 767px) {
+
+    .wy-table-responsive table td {
+       /* !important prevents the common CSS stylesheets from overriding
+          this as on RTD they are loaded after this stylesheet */
+       white-space: normal !important;
+    }
+ 
+    .wy-table-responsive {
+       overflow: visible !important;
+    }
+ }
+
+/* override table width restrictions */
+/* .wy-table-responsive table td, .wy-table-responsive table th {
+    white-space: normal;
+}
+
+.wy-table-responsive {
+    margin-bottom: 24px;
+    max-width: 100%;
+    overflow: visible;
+} */
+
+.wy-grid-for-nav section {
+    background-color: #fcfcfc !important;
+}
+
+.wy-nav-content {
+    max-width: auto !important;
+}