Changed references to "key" to say "button"

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>
Changed some wording

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>
New project code

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>
Style fixes

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>
Enabled student feedback link

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>