Add word-break to repo description in home page (#27924) (#27957)

Backport #27924 by @yp05327

In #25315, @denyskon fixed UI on mobile view.
But for the repo description, on desktop view there's no word-break. 
So maybe we can just add `gt-word-break` to fix it on both mobile view
and desktop view.

Before:
desktop view:

![image](https://github.com/go-gitea/gitea/assets/18380374/a7659f5b-fbe9-400a-8cc2-cca44778556e)
mobile view:

![image](https://github.com/go-gitea/gitea/assets/18380374/611f1b81-58ac-4213-b165-5c73e24ca79e)

After:
desktop view:

![image](https://github.com/go-gitea/gitea/assets/18380374/f21bf3a7-f6aa-457d-9bfa-5c57659c68b1)
mobile view(almost same?)

![image](https://github.com/go-gitea/gitea/assets/18380374/ad2d1a4d-1172-402c-b5fc-5e910657847d)

Co-authored-by: yp05327 <576951401@qq.com>
Co-authored-by: silverwind <me@silverwind.io>

templates/repo/home.tmpl

@@ -5,7 +5,7 @@
 		{{template "base/alert" .}}
 		{{template "repo/code/recently_pushed_new_branches" .}}
 		{{if and (not .HideRepoInfo) (not .IsBlame)}}
-		<div class="ui repo-description">
+		<div class="ui repo-description gt-word-break">
 			<div id="repo-desc" class="gt-font-16">
 				{{$description := .Repository.DescriptionHTML $.Context}}
 				{{if $description}}<span class="description">{{$description | RenderCodeBlock}}</span>{{else if .IsRepositoryAdmin}}<span class="no-description text-italic">{{ctx.Locale.Tr "repo.no_desc"}}</span>{{end}}

web_src/css/repo.css

@@ -211,14 +211,14 @@
   display: flex;
   justify-content: space-between;
   align-items: center;
+  gap: 5px;
   margin-bottom: 5px;
 }
 
-@media (max-width: 767.68px) {
+@media (max-width: 767.98px) {
   .repository.file.list .repo-description {
     flex-direction: column;
-    gap: 8px;
-    align-items: normal;
+    align-items: stretch;
   }
 }