[gimp-web] Update a bit the top sentence of the donation page.

[Jehan <jehanp src gnome org>]

commit 1ef6ea5a6d0b256f6028a448fcbf1aaefec6bfe9
Author: Jehan <jehan girinstud io>
Date:   Thu May 6 23:02:27 2021 +0200

    Update a bit the top sentence of the donation page.

 content/donating/index.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/content/donating/index.md b/content/donating/index.md
index 9b970b54..f3a89514 100644
--- a/content/donating/index.md
+++ b/content/donating/index.md
@@ -3,7 +3,8 @@ Date: 2015-08-14T15:54:25-05:00
 Author: Pat David
 Status: hidden
 
-Donating money to the GIMP project is easy!
+Donating money to the GIMP project is easy and important as it allows the
+project sustainability.
 
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