Add a Safari Pinned Tab Icon (#8983)

Icon adopted from grafana_icon.svg

Reference document:
https://developer.apple.com/library/content/documentation/AppleApplicati
ons/Reference/SafariWebContent/pinnedTabs/pinnedTabs.html

public/img/grafana_mask_icon.svg

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public/views/index.html

@@ -17,6 +17,7 @@
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