Updated favicon icons to remove invalid html and modernise #300
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Updates apple touch icon sizes and syntax that follow Apple spec
https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html
and
https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
This also makes html valid according to W3C
W3C validator before
W3C validator after
Note: tested by manual upload of the current gov.uk source and replaced declaration