📝 Add scheduler documentation

[shnizzedy]

Fixes

Related to FCP-INDI/C-PAC#1363, FCP-INDI/cpac#1 & FCP-INDI/C-PAC_GUI#57 by @anibalsolon

Description

Adds user/scheduler and user/dashboard to the C-PAC documentation.

Still need to

• add details about running the dashboard
• add details about running python -m cpac.api
• maybe
  • move some / all of the technical details from dashboard to scheduler
  • punch up a bit of language and interlinking between the scheduler and dashboard docs.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• I added tests for the changes I made (if applicable).
• I updated the changelog.
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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