Add SemiBold for SourceSerif4

Author: GuillaumeGomez

Diff for: src/librustdoc/build.rs

@@ -25,6 +25,7 @@ fn main() {
         "static/fonts/FiraMono-Medium.woff2",
         "static/fonts/FiraSans-LICENSE.txt",
         "static/fonts/SourceSerif4-Regular.ttf.woff2",
+        "static/fonts/SourceSerif4-Semibold.ttf.woff2",
         "static/fonts/SourceSerif4-Bold.ttf.woff2",
         "static/fonts/SourceSerif4-It.ttf.woff2",
         "static/fonts/SourceSerif4-LICENSE.md",

Diff for: src/librustdoc/html/static/COPYRIGHT.txt

@@ -36,7 +36,7 @@ included, and carry their own copyright notices and license terms:
     See SourceCodePro-LICENSE.txt.
 
 * Source Serif 4 (SourceSerif4-Regular.ttf.woff2, SourceSerif4-Bold.ttf.woff2,
-    SourceSerif4-It.ttf.woff2):
+    SourceSerif4-It.ttf.woff2, SourceSerif4-Semibold.ttf.woff2):
 
     Copyright 2014-2021 Adobe (http://www.adobe.com/), with Reserved Font Name
     'Source'. All Rights Reserved. Source is a trademark of Adobe in the United

Diff for: src/librustdoc/html/static/css/rustdoc.css

@@ -74,7 +74,7 @@ xmlns="http://www.w3.org/2000/svg" fill="black" height="18px">\
 }
 @font-face {
 	font-family: 'Fira Sans';
-	font-style: normal;
+	font-style: italic;
 	font-weight: 500;
 	src: local('Fira Sans Medium Italic'),
 		url("FiraSans-MediumItalic-ccf7e434.woff2") format("woff2");
@@ -114,6 +114,14 @@ xmlns="http://www.w3.org/2000/svg" fill="black" height="18px">\
 		url("SourceSerif4-It-ca3b17ed.ttf.woff2") format("woff2");
 	font-display: swap;
 }
+@font-face {
+	font-family: 'Source Serif 4';
+	font-style: normal;
+	font-weight: 500;
+	src: local('Source Serif 4 Semibold'),
+		url("SourceSerif4-Semibold-457a13ac.ttf.woff2") format("woff2");
+	font-display: swap;
+}
 @font-face {
 	font-family: 'Source Serif 4';
 	font-style: normal;
@@ -289,7 +297,7 @@ summary.hideme,
 .rustdoc-breadcrumbs,
 /* This selector is for the items listed in the "all items" page. */
 ul.all-items {
-	font-family: var(--font-family);
+	font-family: "Fira Sans", Arial, NanumBarunGothic, sans-serif;
 }
 
 #toggle-all-docs,

Diff for: src/librustdoc/html/static/fonts/SourceSerif4-Semibold.ttf.woff2

@@ -106,6 +106,7 @@ static_files! {
     fira_mono_medium => "static/fonts/FiraMono-Medium.woff2",
     fira_sans_license => "static/fonts/FiraSans-LICENSE.txt",
     source_serif_4_regular => "static/fonts/SourceSerif4-Regular.ttf.woff2",
+    source_serif_4_semibold => "static/fonts/SourceSerif4-Semibold.ttf.woff2",
     source_serif_4_bold => "static/fonts/SourceSerif4-Bold.ttf.woff2",
     source_serif_4_italic => "static/fonts/SourceSerif4-It.ttf.woff2",
     source_serif_4_license => "static/fonts/SourceSerif4-LICENSE.md",