Revamp formatting and linting on commit

Remove the prepare script, and run the two stages manually. Better
handle Black reformatting by doing a check (for the errcode) then
reformat and abort commit to review.

build-and-deploy.sh

@@ -32,7 +32,8 @@ pushd $( git rev-parse --show-toplevel ) &>/dev/null
 
 # Prepare code
 echo "Preparing code (format and lint)..."
-./prepare || exit
+./format || exit 1
+./lint || exit 1
 
 # Build the packages
 echo -n "Building packages... "