Fix margin on the new/edit project page. (#25885)

New/Edit Project page consistent layout. Fix margin on the new/edit
page.

Before: 
<img width="1381" alt="image"
src="https://github.com/go-gitea/gitea/assets/80308335/303e128c-0bd0-4289-a395-ff077e33b1c8">
<img width="1392" alt="image"
src="https://github.com/go-gitea/gitea/assets/80308335/d11f7a42-ddf4-4c0a-a1b1-b8cefca9dfa1">

After
<img width="1390" alt="image"
src="https://github.com/go-gitea/gitea/assets/80308335/8ae1a979-9050-4d68-8f5d-9dfaa620c0e8">
<img width="1391" alt="image"
src="https://github.com/go-gitea/gitea/assets/80308335/24a62711-dc0a-4425-bf84-7c1896b9a005">

Co-authored-by: silverwind <me@silverwind.io>

templates/projects/new.tmpl

@@ -8,9 +8,9 @@
 	{{end}}
 </h2>
 {{template "base/alert" .}}
-<form class="ui form grid" action="{{.Link}}" method="post">
+<form class="ui form" action="{{.Link}}" method="post">
 	{{.CsrfTokenHtml}}
-	<div class="eleven wide column">
+	<div>
 		<input type="hidden" id="redirect" name="redirect" value="{{.redirect}}">
 		<div class="field {{if .Err_Title}}error{{end}}">
 			<label>{{.locale.Tr "repo.projects.title"}}</label>
@@ -55,7 +55,7 @@
 		</div>
 	</div>
 	<div class="divider"></div>
-	<div class="ui left">
+	<div class="gt-text-right">
 		<a class="ui cancel button" href="{{$.CancelLink}}">
 			{{.locale.Tr "repo.milestones.cancel"}}
 		</a>