Use flex to align SVG and text (#25163)

The code can be as simple as:

```html
<div class="flex-text-block">{{svg "octicon-alert"}} {{svg "octicon-x"}} text (block)</div>
<div><div class="flex-text-inline">{{svg "octicon-alert"}} {{svg "octicon-x"}} text</div> (inline)</div>
<div><button class="ui red button">{{svg "octicon-alert" 24}} {{svg "octicon-x" 24}} text</button></div>
```


![image](https://github.com/go-gitea/gitea/assets/2114189/1d3c10f1-0bc7-4c26-b236-bad537d5c465)

---------

Co-authored-by: Giteabot <teabot@gitea.io>

web_src/css/modules/button.css

@@ -24,10 +24,6 @@
   color: var(--color-text);
 }
 
-.ui.button.no-text .icon {
-  margin: 0 !important;
-}
-
 .delete-button,
 .delete-button:hover {
   color: var(--color-red);