Revert "Use flex-container for repo and org settings (go-gitea#27418)"

This reverts commit cbc0b73.

Author: wxiaoguang

templates/org/settings/layout_head.tmpl

@@ -1,9 +1,9 @@
 {{template "base/head" .ctxData}}
 <div role="main" aria-label="{{.ctxData.Title}}" class="page-content {{.pageClass}}">
 	{{template "org/header" .ctxData}}
-	<div class="ui container flex-container">
+	<div class="ui container stackable grid">
 		{{template "org/settings/navbar" .ctxData}}
-		<div class="flex-container-main">
+		<div class="twelve wide column">
 			{{template "base/alert" .ctxData}}
 			{{/* block: org-setting-content */}}
 

templates/org/settings/navbar.tmpl

@@ -1,4 +1,4 @@
-<div class="flex-container-nav">
+<div class="four wide column">
 	<div class="ui fluid vertical menu">
 		<div class="header item">{{ctx.Locale.Tr "org.settings"}}</div>
 		<a class="{{if .PageIsSettingsOptions}}active {{end}}item" href="{{.OrgLink}}/settings">

templates/repo/settings/layout_head.tmpl

@@ -1,9 +1,9 @@
 {{template "base/head" .ctxData}}
 <div role="main" aria-label="{{.ctxData.Title}}" class="page-content {{.pageClass}}">
 	{{template "repo/header" .ctxData}}
-	<div class="ui container flex-container">
+	<div class="ui container stackable grid">
 		{{template "repo/settings/navbar" .ctxData}}
-		<div class="flex-container-main">
+		<div class="twelve wide column">
 			{{template "base/alert" .ctxData}}
 			{{/* block: repo-setting-content */}}
 

templates/repo/settings/navbar.tmpl

@@ -1,4 +1,4 @@
-<div class="flex-container-nav">
+<div class="four wide column">
 	<div class="ui fluid vertical menu">
 		<div class="header item">{{ctx.Locale.Tr "repo.settings"}}</div>
 		<a class="{{if .PageIsSettingsOptions}}active {{end}}item" href="{{.RepoLink}}/settings">