fix missing gifs of tea 0.7.0 post (#154)

as title

Reviewed-on: https://gitea.com/gitea/blog/pulls/154
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Norwin <noerw@noreply.gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-committed-by: 6543 <6543@obermui.de>

content/post/release-of-tea-0.7.0.md

@@ -18,11 +18,11 @@ for more options look at the [README.md](https://gitea.com/gitea/tea#installatio
 
 ## Demo
 
-![demo gif](https://gitea.com/gitea/tea/media/branch/master/demo.gif)
+![demo gif](/demos/13972/1.gif)
 
 ## Review Feature
 
-![review gif](https://gitea.com/attachments/78c64512-66d2-4434-8639-c00b01a9dd99)
+![review gif](/demos/13972/2.gif)
 
 _Thanks to [@noerw](https://github.com/noerw)_