fix: remove GitHub repository link from index handler and update test expectations

Author: edgard

internal/server/server.go

@@ -241,10 +241,6 @@ func (s *Server) indexHandler(w http.ResponseWriter, r *http.Request) {
 				Address: s.config.MetricsPath,
 				Text:    "Metrics",
 			},
-			{
-				Address: "https://github.com/edgard/iperf3_exporter",
-				Text:    "GitHub Repository",
-			},
 		},
 		HeaderColor: "#1a73e8",
 	}
@@ -316,7 +312,7 @@ scrape_configs:
     </pre>
     `
 
-	// Add custom CSS for tables
+	// Add custom CSS
 	landingConfig.ExtraCSS = `
     table {
         border-collapse: collapse;

internal/server/server_test.go

@@ -98,7 +98,6 @@ func TestIndexHandler(t *testing.T) {
 	expectedContent := []string{
 		"iPerf3 Exporter",
 		"Metrics",
-		"GitHub Repository",
 		"Quick Start",
 		"Probe Parameters",
 	}