Update index.html
Update index.html

Added homescreen support for Apple Devices and Google Chrome.
Set theme color for Google Chrome to Google Material Color "Red 900".

https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html
https://developer.chrome.com/multidevice/android/installtohomescreen
https://material.io/guidelines/style/color.html#color-color-palette
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