Provide built-in templates

[darekkay]

Based on #43, I thought it would be a good idea to provide build-in templates. Currently, I can either use the default app or provide a custom template via --template-file parameter. There is an example template for others to apply or to use as inspiration to create custom templates. However, it would be nice to provide built-in templates so that it's not required to set anything up locally, e.g.:

static-marks build --template default [...]
static-marks build --template minimal [...]