Move all login and account creation page labels to be above inputs (#29432)

There are a few inconsistencies within Gitea and this PR addresses one
of them. This PR updates the sign-in page layout, including the register
and openID tabs, to match the layout of the settings pages
(/user/settings) for more consistency.

This PR updates the following routes:
`/user/login`
`/user/sign_up`
`/user/login/openid`
`/user/forgot_password`
`/user/link_account`
`/user/recover_account`

**Before**
<img width="968" alt="Screenshot 2024-02-05 at 8 27 24 AM"
src="https://github.com/go-gitea/gitea/assets/6152817/fb0cb517-57c0-4eed-be1d-56f36bd1960d">


**After**
<img width="968" alt="Screenshot 2024-02-05 at 8 26 39 AM"
src="https://github.com/go-gitea/gitea/assets/6152817/428d691d-0a42-4a67-a646-05527f2a7b41">


This PR addresses a revert of the original PR due to this
[comment](https://github.com/go-gitea/gitea/pull/28753#issuecomment-1956596817).

---------

Co-authored-by: rafh <rafaelheard@gmail.com>

templates/user/auth/captcha.tmpl

@@ -1,9 +1,8 @@
 {{if .EnableCaptcha}}{{if eq .CaptchaType "image"}}
 	<div class="inline field">
-		<label>{{/* This is CAPTCHA field */}}</label>
 		{{.Captcha.CreateHTML}}
 	</div>
-	<div class="required inline field {{if .Err_Captcha}}error{{end}}">
+	<div class="required field {{if .Err_Captcha}}error{{end}}">
 		<label for="captcha">{{ctx.Locale.Tr "captcha"}}</label>
 		<input id="captcha" name="captcha" value="{{.captcha}}" autocomplete="off">
 	</div>