Improve profile for Organizations (#27982)

Fixes some problems in #27955:
- autofocus of the search box
before:
if access the home page will jump to the search box

![image](7f100e8d-2bd6-4563-85ba-d6008ffc71d7)
after:
will not jump to the search box

![image](9aab382c-8ebe-4d18-b990-4adbb6c341ad)

- incorrect display of overview tab
before:

![image](b24c79e8-9b79-4576-9276-43bd19172043)
after:

![image](7aab5827-f086-4874-bd84-39bd81b872f3)

- improve the permission check to the private profile repo
In #26295, we simply added access control to the private profile.
But if user have access to the private profile repo , we should also
display the profile.

- add a button which can jump to the repo list?
I agree @wxiaoguang 's opinion here:
https://github.com/go-gitea/gitea/pull/27955#issuecomment-1803178239
But it seems that this feature is sponsored. 
So can we add a button which can quickly jump to the repo list or just
move profile to the `overview` page?

---------

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

templates/explore/repo_search.tmpl

@@ -3,7 +3,7 @@
 		<input type="hidden" name="sort" value="{{$.SortType}}">
 		<input type="hidden" name="language" value="{{$.Language}}">
 		<div class="ui fluid action input">
-			{{template "shared/searchinput" dict "Value" .Keyword "AutoFocus" true}}
+			{{template "shared/searchinput" dict "Value" .Keyword "AutoFocus" (not .ProfileReadme)}}
 			{{if .PageIsExploreRepositories}}
 				<input type="hidden" name="only_show_relevant" value="{{.OnlyShowRelevant}}">
 			{{else if .TabName}}

templates/user/overview/header.tmpl

@@ -1,5 +1,5 @@
 <div class="ui secondary stackable pointing menu">
-	{{if .HasProfileReadme}}
+	{{if and .HasProfileReadme .ContextUser.IsIndividual}}
 	<a class="{{if eq .TabName "overview"}}active {{end}}item" href="{{.ContextUser.HomeLink}}?tab=overview">
 		{{svg "octicon-info"}} {{ctx.Locale.Tr "user.overview"}}
 	</a>