fix(favicon) make favicon visible in dark-themed browser

Fixes: #6182

Makefile

 
 source-package:
 	mkdir -p source_package/jitsi-meet/css && \
-	cp -r *.js *.html resources/*.txt favicon.ico fonts images libs static sounds LICENSE lang source_package/jitsi-meet && \
+	cp -r *.js *.html resources/*.txt fonts images libs static sounds LICENSE lang source_package/jitsi-meet && \
 	cp css/all.css source_package/jitsi-meet/css && \
 	(cd source_package ; tar cjf ../jitsi-meet.tar.bz2 jitsi-meet) && \
 	rm -rf source_package

title.html

 <meta itemprop="name" content="Jitsi Meet"/>
 <meta itemprop="description" content="Join a WebRTC video conference powered by the Jitsi Videobridge"/>
 <meta itemprop="image" content="images/jitsilogo.png?v=1"/>
-<link rel="icon" type="image/png" href="images/favicon.ico?v=1"/>
+<link rel="icon" href="images/favicon.svg?v=1">