- download your custom bootstrap archive
- go to https://gist.github.com
- put content from your config.json file
- name the new gist config.json
- publish the gist (anonymously or under your name)
- save the gist number - the number in the gist url
- open bootstrap customizer (http://getbootstrap.com/customize) or your local one
- add the gist number to the url "?id=your_gist_number"