Unpin libsass (wagtail 2.6+ needs a more modern version to function).…

… Fix a few invalid places in our vendor scss files. Move to wagtail 2.8.

ietf/static/css/jsenabled.scss

@@ -60,7 +60,7 @@
     }
 
     &:before {
-        @extend %bleed-left;
+        @extend %bleed-left !optional;
         background: $light;
         margin-left: -999em;
         position: absolute;

ietf/static/css/main.scss

@@ -1071,12 +1071,13 @@ dl {
 }
 
 @media #{$tabletxl} {
+/*
     @include keyframes(slide-down) {
         0% { transform: translate3d( 110%, 100%, 0 );}
         1% { transform: translate3d( 0%, 0, 0 ); }
         90% { transform: translate3d( 0%, 0, 0 ); }
     }
-
+*/
     .link-preview {
         display: block;
         width: 160px;
@@ -1088,7 +1089,9 @@ dl {
         padding: 10px;
         transform: translate3d( 110%, 0, 0 );
         @include transition( transform 0.25s ease 0s );
+/*
         @include animation('slide-down 5s 3');
+*/
         &:after {
             content: '';
             position: absolute;
@@ -1130,7 +1133,7 @@ dl {
 }
 
 .link-preview-show {
-    @extend #link-preview;
+    @extend #link-preview !optional;
     display: block;
     position: relative;
     margin: 0 auto;

ietf/static/css/mixins.scss

@@ -327,8 +327,8 @@ $prefixes: (-webkit, -moz, -ms, -o);
 }
 
 //animation ===================================================================================//
-@mixin keyframes($animation-name) {
 /*
+@mixin keyframes($animation-name) {
 	@-webkit-keyframes $animation-name {
 		@content;
 	}
@@ -344,8 +344,8 @@ $prefixes: (-webkit, -moz, -ms, -o);
 	@keyframes $animation-name {
 		@content;
 	}
-	*/
 }
+*/
 
 @mixin animation($str) {
 	-webkit-animation: #{$str};

requirements.txt

@@ -1,9 +1,9 @@
 Django>=2.2,<3
 djangorestframework>=3.8
 psycopg2>=2.7.5
-wagtail==2.3
+wagtail>=2.8,<2.9
 django-libsass>=0.8
-libsass==0.8.3
+libsass>=0.8.3
 future>=0.15.2
 django_compressor>=2.2
 mod_wsgi>=4.6