Add missing favicon images

[François Marier]

There are a couple of missing icons for new browsers and OSes: https://realfavicongenerator.net/favicon_checker?protocol=https&site=libravatar.org

Here is the updated HTML recommended by that site:

<link rel="apple-touch-icon" sizes="57x57" href="/apple-touch-icon-57x57.png">
<link rel="apple-touch-icon" sizes="60x60" href="/apple-touch-icon-60x60.png">
<link rel="apple-touch-icon" sizes="72x72" href="/apple-touch-icon-72x72.png">
<link rel="apple-touch-icon" sizes="76x76" href="/apple-touch-icon-76x76.png">
<link rel="apple-touch-icon" sizes="114x114" href="/apple-touch-icon-114x114.png">
<link rel="apple-touch-icon" sizes="120x120" href="/apple-touch-icon-120x120.png">
<link rel="apple-touch-icon" sizes="144x144" href="/apple-touch-icon-144x144.png">
<link rel="apple-touch-icon" sizes="152x152" href="/apple-touch-icon-152x152.png">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon-180x180.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="manifest" href="/manifest.json">
<link rel="mask-icon" href="/safari-pinned-tab.svg" color="#fa711f">
<meta name="apple-mobile-web-app-title" content="Libravatar">
<meta name="application-name" content="Libravatar">
<meta name="msapplication-TileColor" content="#fa711f">
<meta name="msapplication-TileImage" content="/mstile-144x144.png">
<meta name="theme-color" content="#fa711f">

(via Don Marti @ https://blog.zgp.org/hey-kids-favicon/)

[François Marier (fmarier)]

This is a follow-up on what was done in bug 1223132 and bug 809693.

[François Marier (fmarier)]

Apple icons are now documented here:

https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html#//apple_ref/doc/uid/TP40002051-CH3-SW4

[François Marier (fmarier)]

This has rolled out to production but these files were missing:

https://www.libravatar.org/browserconfig.xml
https://www.libravatar.org/manifest.json

I have pushed a fix in git and hotfixed on production.