[devhelp] docs: Add the logo image to the manifest

[Emmanuele Bassi <ebassi src gnome org>]

commit 2aad6a0c7a308d7c667248a0eda5ddbcb3ddfc5d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Jul 15 15:15:21 2021 +0100

    docs: Add the logo image to the manifest

 docs/reference/devhelp.toml.in | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/docs/reference/devhelp.toml.in b/docs/reference/devhelp.toml.in
index 161efea3..14d37503 100644
--- a/docs/reference/devhelp.toml.in
+++ b/docs/reference/devhelp.toml.in
@@ -33,3 +33,6 @@ base_url = "https://gitlab.gnome.org/GNOME/devhelp/-/blob/HEAD/devhelp/";
 content_files = [
   "api-breaks.md",
 ]
+content_images = [
+  "devhelp.svg",
+]