Inform the user about maximum profile picture size.

[ironveil]

Feature Description

I noticed that when you try and set a profile picture that is too big, it comes up with a warning about how it is too big. However, it doesn't actually say how big the maximum file size can be. Is there a way to add the maximum file size onto the prompt?

Screenshots

[lng2020]

Actually, you can config this one, see

gitea/docs/content/administration/config-cheat-sheet.en-us.md

Line 798 in 97aa749

- `AVATAR_MAX_FILE_SIZE`: **1048576** (1MiB): Maximum avatar image file size in bytes.

An example here

gitea/custom/conf/app.example.ini

Line 1784 in 97aa749

;AVATAR_MAX_FILE_SIZE = 1048576

But I agree that the maximum profile picture size should be informed