Issue and Pulls lists rework (#13594)

* Issue and Pulls lists rework

Reorganized and restyled the issue and pull request lists.

* color and layout tweaks

* use new issue list on dashboard as well

* move pagination into template

* misc tweaks

* fix label hover

* fix milestone list

* fix discrepancies between issue and milestone list, add new 'merge' helper

* fmt

* simplify merge helper

* remove whitespace

* fix startIndex

* further simplify dict merging

* rename helper to 'mergeinto' for clarity

* allow bottom-row to wrap

Co-authored-by: Lauris BH <lauris@nix.lv>

web_src/less/themes/theme-arc-green.less

@@ -73,6 +73,7 @@
   --color-box-header: #454a57;
   --color-box-body: #353945;
   --color-text: #b6bac5;
+  --color-text-light: #969aa5;
   --color-timeline: #4a505c;
   --color-input-text: #dcdcdc;
   --color-input-background: #2e323e;
@@ -680,18 +681,6 @@ a.ui.basic.label:hover {
   background-color: #383c4a;
 }
 
-.issue.list > .item .title {
-  color: #87ab63;
-}
-
-.issue.list > .item .title:hover {
-  color: #a0cc75;
-}
-
-.issue.list > .item {
-  border-bottom: 1px dashed #475767;
-}
-
 .ui.green.label,
 .ui.green.labels .label,
 .ui.basic.green.label {
@@ -708,10 +697,6 @@ a.ui.basic.green.label:hover {
   color: #fff !important;
 }
 
-.issue.list > .item .comment {
-  color: var(--color-secondary-dark-6);
-}
-
 .ui.basic.red.active.button,
 .ui.basic.red.buttons .active.button {
   box-shadow: 0 0 0 1px #b75252 inset !important;
@@ -1019,10 +1004,6 @@ a.ui.basic.green.label:hover {
   text-shadow: -2px 0 #383c4a, 0 2px #383c4a, 2px 0 #383c4a, 0 -2px #383c4a;
 }
 
-.ui .text.grey a {
-  color: #dbdbdb !important;
-}
-
 .repository.view.issue .comment-list .comment .content .header {
   color: #dbdbdb;
   background-color: var(--color-secondary);
@@ -1045,10 +1026,6 @@ a.ui.basic.green.label:hover {
   background: #353945;
 }
 
-.ui .text.grey a:hover {
-  color: #dbdbdb !important;
-}
-
 .ui.basic.green.active.button,
 .ui.basic.green.buttons .active.button {
   color: #87ab63 !important;