[fractal/fractal-next] docs: Set crate logo as the FractalNext icon

[Julian Sparber <jsparber src gnome org>]

commit a5b5055ab06050b0bf6a97f3eec17050b952ea32
Author: Veli Tasali <veli tasali gmail com>
Date:   Thu Apr 29 00:05:45 2021 +0300

    docs: Set crate logo as the FractalNext icon
    
    This replaces the default Rust logo as the app
    icon on all documentation pages under `fractal`
    package.

 src/main.rs | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/main.rs b/src/main.rs
index 4a3e1a43..d29c9b87 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,7 @@
+#![doc(
+    html_logo_url = 
"https://gitlab.gnome.org/GNOME/fractal/-/raw/fractal-next/data/icons/org.gnome.FractalNext.svg?inline=false";
+)]
+
 mod application;
 #[rustfmt::skip]
 mod config;