bootstrap: Remove bootstrap CSS for pull-right class.

We use pull-right class for copy button with the multi-use
invite link only and this commit adds CSS for that specific
element. This commit then removes the bootstrap CSS for
pull-right class and also removes pull-right class from the
copy button since it is no longer required.

web/styles/zulip.css

@@ -800,6 +800,7 @@ li,
     margin-right: -32px;
     margin-top: -1px;
     padding: 6px 3px 6px 13px;
+    float: right;
 
     /* This property nullifies the box-shadow rendered by .btn class */
     &:active {

web/templates/copy_invite_link.hbs

@@ -1,7 +1,7 @@
 {{t "Link:" }}
 <a href="{{ invite_link }}" id="multiuse_invite_link">{{ invite_link }}</a>
 &nbsp;
-<a class="btn pull-right copy_button_base tippy-zulip-tooltip" data-tippy-content="{{t 'Copy link' }}" aria-label="{{t 'Copy link' }}"
+<a class="btn copy_button_base tippy-zulip-tooltip" data-tippy-content="{{t 'Copy link' }}" aria-label="{{t 'Copy link' }}"
   id='copy_generated_invite_link' data-clipboard-text="{{ invite_link }}">
     {{> copy_to_clipboard_svg }}
 </a>

web/third/bootstrap/css/bootstrap.css

@@ -227,23 +227,6 @@ blockquote small {
 blockquote small:before {
   content: '\2014 \00A0';
 }
-blockquote.pull-right {
-  float: right;
-  padding-right: 15px;
-  padding-left: 0;
-  border-right: 5px solid #eeeeee;
-  border-left: 0;
-}
-blockquote.pull-right p,
-blockquote.pull-right small {
-  text-align: right;
-}
-blockquote.pull-right small:before {
-  content: '';
-}
-blockquote.pull-right small:after {
-  content: '\00A0 \2014';
-}
 q:before,
 q:after,
 blockquote:before,
@@ -620,9 +603,6 @@ input.search-query {
 .nav > li > a > img {
   max-width: none;
 }
-.nav > .pull-right {
-  float: right;
-}
 .nav-header {
   display: block;
   padding: 3px 15px;
@@ -1150,10 +1130,6 @@ input.search-query {
   -moz-background-clip: padding;
   background-clip: padding-box;
 }
-.dropdown-menu.pull-right {
-  right: 0;
-  left: auto;
-}
 .dropdown-menu .divider {
   height: 1px;
   margin: 9px 1px;
@@ -1219,10 +1195,6 @@ input.search-query {
   top: 0;
   z-index: 990;
 }
-.pull-right > .dropdown-menu {
-  right: 0;
-  left: auto;
-}
 .dropup .caret {
   border-top: 0;
   border-bottom: 4px solid #000000;
@@ -1371,9 +1343,6 @@ button.close {
   border: 0;
   -webkit-appearance: none;
 }
-.pull-right {
-  float: right;
-}
 .pull-left {
   float: left;
 }
@@ -1437,8 +1406,7 @@ button.close {
   }
 }
 @media (max-width: 480px) {
-  .media .pull-left,
-  .media .pull-right {
+  .media .pull-left {
     float: none;
     display: block;
     margin-bottom: 10px;