Make submit buy green

[yangwao]

When a user clicks on BUY, do BUY.

Merge logic of button Submit BUY into BUY so user doesn't need to click twice.

[prachi00]

@yangwao I'll do this

[vikiival]

In commit of 49a6235 , the buy logic was broken

[yangwao]

This missing on main-nuxt