Move scripts to their own directory.
Add `serve` script for serving locally (from internal build repo).
Rename:
- clean.sh -> script/clean
- make.sh -> script/make
Now you can type `make serve` to serve the guide locally.
$ make <TAB>
all clean guide serve
Requirements are still included in the `serve` file.
Signed-off-by: Sharp-tailed Grouse <sharptail@riseup.net>
