docs: rework tutorial to not use global $ #1046
Merged
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Still wip, i need to go through the content again.
I changed the "parameters" page to use functions and function parameters instead of a global config object, and reworked the following sections. I've also added a section at the end describing how to use a local config object to avoid some repetition but without the issues associated with having it as a global.
Fixes #816