add templates for main group page

templates/group/header.tmpl

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+<div class="ui container">
+	<div class="repo-group-header">
+		<div class="flex-item">
+			<div class="flex-item-main">
+				<div class="flex-item-title tw-text-18">
+					<a class="muted tw-font-normal" href="{{.Group.Owner.HomeLink}}">{{.Group.Owner.Name}}</a>
+					{{- range .Breadcrumbs -}}
+						/<a class="muted{{if eq .ID $.Group.ID}} tw-font-bold active{{else}} tw-font-normal{{end}}"
+								href="{{.GroupLink}}">{{.Name}}</a>
+					{{- end -}}
+				</div>
+			</div>
+		</div>
+	</div>
+</div>
+<div class="ui container tw-flex">
+	{{ctx.AvatarUtils.Avatar .Group 100 "group-avatar"}}
+	<div id="repo-group-info" class="tw-flex tw-flex-col tw-flex-1 tw-break-anywhere">
+		<div class="ui header">
+			{{.Group.Name}}
+			<span class="repo-group-visibility">
+				{{if .Group.Visibility.IsLimited}}
+					<span
+						class="ui large basic horizontal label">
+						{{ctx.Locale.Tr "org.settings.visibility.limited_shortname"}}
+					</span>
+				{{end}}
+				{{if .Group.Visibility.IsPrivate}}
+					<span class="ui large basic horizontal label">
+						{{ctx.Locale.Tr "org.settings.visibility.private_shortname"}}
+					</span>
+				{{end}}
+			</span>
+			<span class="tw-flex tw-items-center tw-gap-1 tw-ml-auto tw-text-16 tw-whitespace-nowrap">
+				{{if .EnableFeed}}
+					<a class="ui basic label button tw-mr-0" href="{{.Group.GroupLink}}.rss"
+						 data-tooltip-content="{{ctx.Locale.Tr "rss_feed"}}">
+						{{svg "octicon-rss" 24}}
+					</a>
+				{{end}}
+			</span>
+		</div>
+		{{if .RenderedDescription}}
+			<div class="render-content markup tw-break-anywhere">{{.RenderedDescription}}</div>
+		{{end}}
+	</div>
+</div>
+
+{{ template "group/menu" . }}

templates/group/home.tmpl

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+{{template "base/head" .}}
+<div role="main" aria-label="{{.Title}}" class="page-content repo-group profile">
+	{{template "group/header" .}}
+	<div class="ui container">
+
+		<div class="ui mobile reversed stackable grid">
+			<div class="ui eleven wide column">
+				{{template "shared/repo_search" .}}
+				{{template "explore/repo_list" .}}
+				{{template "base/paginate" .}}
+			</div>
+			<div class="ui five wide column">
+				{{ template "group/sidebar/menu" .}}
+			</div>
+		</div>
+	</div>
+</div>
+{{template "base/footer" .}}

templates/group/menu.tmpl

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+<div class="ui container">
+	<overflow-menu class="ui secondary pointing tabular borderless menu tw-mb-4">
+		<div class="overflow-menu-items">
+			<a class="{{if .PageIsViewRepositories}}active {{end}}item" href="{{.GroupLink}}">
+				{{svg "octicon-repo"}} {{ctx.Locale.Tr "user.repositories"}}
+				{{if .RepoCount}}
+					<div class="ui small label">{{.RepoCount}}</div>
+				{{end}}
+			</a>
+			{{if .CanReadProjects}}
+			<a class="{{if .PageIsViewProjects}}active {{end}}item" href="{{$.Group.GroupLink}}/projects">
+				{{svg "octicon-project-symlink"}} {{ctx.Locale.Tr "user.projects"}}
+				{{if .ProjectCount}}
+					<div class="ui small label">{{.ProjectCount}}</div>
+				{{end}}
+			</a>
+			{{end}}
+			{{if .IsGroupMember}}
+				<a class="{{if $.PageIsGroupTeams}}active {{end}}item" href="{{$.OrgGroupLink}}/teams">
+					{{svg "octicon-people"}} {{ctx.Locale.Tr "org.teams"}}
+					{{if .NumTeams}}
+						<div class="ui small label">{{.NumTeams}}</div>
+					{{end}}
+				</a>
+			{{end}}
+			{{if or .IsGroupOwner .IsGroupAdmin}}
+				<span class="item-flex-space"></span>
+				<a class="{{if .PageIsGroupSettings}}active {{end}}item" href="{{$.OrgGroupLink}}/settings">
+					{{svg "octicon-tools"}} {{ctx.Locale.Tr "repo.settings"}}
+				</a>
+			{{end}}
+		</div>
+	</overflow-menu>
+</div>