[Keyboard] Cannonkeys Instant60 Configurator updates (#6186)

* Rename layout macros

The Instant60's info.json was updated in #6157. The intention seems to have been supporting Community Layouts, but that feature was not implemented. After checking that the layouts conform, rename the appropriate layout macros.

- rename LAYOUT_ansi as LAYOUT_60_ansi
- rename LAYOUT_tsangan as LAYOUT_60_tsangan_hhkb
- update `default` and `tsangan` keymaps

* Enable Community Layout support

Supported Community Layouts:

- 60_ansi (Instant60 ANSI version)
- 60_tsangan_hhkb (Instant60 Tsangan version)