Forms: rename "URL" field to "Website" and update icon

[simison]

Follow up to #40921

Proposed changes:

• For consistency, call the field "Website" just like the label in the block. URL is commonly understood term, but "Website" feels more user friendly/human language.
• Update icon to globe from WP Icons library. Regocniceable symbol felt better than tiny text "URL" that can be hard to read since it's so small.

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[ntsekouras]

LGTM, thanks!

Regarding the icon I don't have any feedback design wise, but it's the one associated with a link for sure and seems okay to me.

[simison]

Changing the icon to "globe" for now as it makes actually more sense and is more common.

Checking with designers in Slack (internal ref p1736849966095219-slack-C0D96691V) — Update: globe it is!