Integrate "Copy Link Button / Copy Frame or Page URL" extension to ArcWTF

[KiKaraage]

So I finally experienced Arc when the devs at The Browser Company opened access to older processors. The "copy current URL" button seems like a nice feature to have, and luckily there's an extension for that on Firefox Add-Ons page!

Copy Link Button / Copy Frame or Page URL

• find URL icon that matches the URL icon Arc uses (most likely a Fluent Design icon like what they did on the Library & New Tab button)
• edit the SVG code so it supported Firefox icon theming
• Integrate it into ArcWTF on the userchrome.css
• Edit the "Customize Toolbar..." configuration on README

Will do it in September

[NikitaTurbo]

copy-link icons.zip

I saw it issue and I wanted to help, so here are the first two steps, the rest a little later

[KiKaraage]

Thank you for helping @NikitaTurbo!

Though I choose to use default Link icon from Fluent, instead of Fluent-ifying the extension icon.

And turns out edge-frfox already have it covered after all 😅 I'm reeeally sorry. Will do it now.