Use relative favicon link in Atom feed

static/image/_favicon.svg

@@ -1,3 +1,3 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://web.resource.org/cc/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" version="1.1" baseProfile="full" width="512px" height="512px" viewBox="0 0 512 512" preserveAspectRatio="xMidYMid meet" id="svg_document" style="zoom: 1;"><!-- Created with macSVG - https://macsvg.org/ - https://github.com/dsward2/macsvg/ --><title id="svg_document_title">Untitled.svg</title><defs id="svg_document_defs"><clipPath id="halfCircle"><rect y="0%" id="rect1" width="50%" height="100%" x="50%"></rect></clipPath><clipPath id="smallHalfCircle"><rect y="50%" id="rect2" width="100%" height="100%" x="0%"></rect></clipPath></defs><g id="main_group"><circle stroke="lightcoral" id="outer_circle" cy="256px" stroke-width="20" fill="none" r="240px" cx="256px" transform=""></circle><circle clip-path="url(#halfCircle)" id="circle1" cy="256px" fill="lightcoral" r="40%" cx="256px" visibility="visible"></circle><circle clip-path="url(#smallHalfCircle)" id="circle2" cy="256px" fill="lightcoral" r="40%" cx="256px" visibility="visible"></circle></g></svg>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://web.resource.org/cc/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" version="1.1" baseProfile="full" width="512px" height="512px" viewBox="0 0 512 512" preserveAspectRatio="xMidYMid meet" id="svg_document" style="zoom: 1;"><!-- Created with macSVG - https://macsvg.org/ - https://github.com/dsward2/macsvg/ --><title id="svg_document_title">favicon.svg</title><defs id="svg_document_defs"><clipPath id="halfCircle"><rect y="0%" id="rect1" width="50%" height="100%" x="50%"></rect></clipPath><clipPath id="smallHalfCircle"><rect y="50%" id="rect2" width="100%" height="100%" x="0%"></rect></clipPath></defs><g id="main_group"><circle stroke="lightcoral" id="outer_circle" cy="256px" stroke-width="20" fill="none" r="240px" cx="256px" transform=""></circle><circle clip-path="url(#halfCircle)" id="circle1" cy="256px" fill="lightcoral" r="40%" cx="256px" visibility="visible"></circle><circle clip-path="url(#smallHalfCircle)" id="circle2" cy="256px" fill="lightcoral" r="40%" cx="256px" visibility="visible"></circle></g></svg>

static/image/favicon.svg

@@ -2,7 +2,7 @@
 <!DOCTYPE svg  PUBLIC '-//W3C//DTD SVG 1.1//EN'  'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
 <svg id="svg_document" width="512px" height="512px" style="zoom:1" baseProfile="full" version="1.1" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
  <!-- Created with macSVG - https://macsvg.org/ - https://github.com/dsward2/macsvg/ -->
- <title id="svg_document_title">Untitled.svg</title>
+ <title id="svg_document_title">favicon.svg</title>
  <defs id="svg_document_defs">
   <clipPath id="halfCircle">
    <rect id="rect1" x="50%" width="50%" height="100%"/>

templates/atom.xml

@@ -15,7 +15,7 @@
 		<uri>https://www.mat.services</uri>
 	</author>
 	<link href="{{ feed_url | safe }}" rel="self" type="application/atom+xml"/>
-	<icon>{{ get_url(path=config.extra.favicon) }}</icon>
+	<icon>{{ config.extra.favicon | safe }}</icon>
 	<rights>&#169; 2022 mat ess</rights>
 	<generator uri="https://www.getzola.org/">Zola</generator>
 	<updated>{{ last_updated | date(format="%+") }}</updated>