Repo avatar fixes (#13891)

- Split up avatar rendering helpers for performance
- Fix showing repo SVG icon when no avatar is set
- Make repo SVG and avatar same size at 32px
- Fix fork line by adding vertical flexbox on repo title

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

web_src/less/_repository.less

@@ -8,38 +8,9 @@
       margin-top: 0;
     }
 
-    .ui.huge.breadcrumb {
-      font-weight: 400;
-      font-size: 1.5rem;
-
-      .label {
-        vertical-align: middle;
-        margin-top: -.29165em;
-      }
-
-      &.repo-title .repo-header-icon {
-        display: inline-block;
-        position: relative;
-
-        .avatar {
-          position: absolute;
-          right: 0;
-          bottom: 0;
-          width: 16px;
-          height: 16px;
-          color: #fafafa;
-          box-shadow: 0 0 0 2px;
-          margin: 0;
-        }
-      }
-    }
-
     .fork-flag {
-      margin-left: 36px;
-      margin-top: 3px;
-      display: block;
       font-size: 12px;
-      white-space: nowrap;
+      margin-top: 2px;
     }
 
     .repo-buttons .svg {
@@ -2985,6 +2956,7 @@ tbody.commit-list {
   align-items: center;
   justify-content: space-between;
   flex-wrap: wrap;
+  word-break: break-all;
 }
 
 .repo-header .repo-buttons {