Create smart fields in ButtonField.jsx

[bndnio]

Description:
When inputing a Facebook or mail link, user must type www.facebook.com/__name or mailto:__email. Instead, this should be auto populated for the user depending on the link type selected by them.

Requires:

• Editor component to be stable
• Props to be relatively stable

Breakdown:

• Change prefix in text field based on type prop
• Create understandable UX for user (interaction shouldn't be surprising)

Time Estimation:
1.5 hrs.