feat(views/admin.html): allow text selection of setting descriptions

This change also swaps out the settings group display from <h3>
to <p> for a better look and feel.

client/views/admin/admin.html

@@ -12,7 +12,7 @@
 			{{else}}
 				{{#with group}}
 					<div class="info">
-						<h3>{{description}}</h3>
+						<p class="settings-description">{{description}}</p>
 					</div>
 				{{/with}}
 				<div class="rocket-form">
@@ -55,7 +55,7 @@
 										{{/if}}
                           <div>
                           {{#if description}}
-                            <small>{{description}}</small>
+                            <small class="settings-description">{{description}}</small>
                           {{/if}}
                         </div>
                         </div>

packages/rocketchat-theme/assets/stylesheets/base.less

@@ -20,6 +20,12 @@
 	-ms-user-select: none;
 	user-select: none;
 }
+.allow-text-selection {
+  -webkit-user-select: text;
+  -moz-user-select: text;
+  -ms-user-select: text;
+  user-select: text;
+}
 
 :focus {
 	outline: 0 !important;
@@ -1706,6 +1712,9 @@ a.github-fork {
 }
 
 .page-settings {
+  .settings-description {
+    .allow-text-selection;
+  }
 	.rocket-form {
 		max-width: none;
 		width: 100%;