04-workflow (#281)

* removed diagrammer call in 'prerequisites' because it is called later and didn't seem relevant here

* minor formatting, language

* more minot formatting, language

* change to zenhub url

* fixed bad url for ganttproject

* added in kanban phrasing and added jira (which has free tier)

* language fixes, changed urls for mermaid, graphviz

* fixed gantt url and gantt example language

* more language fixes

* revised haversine dets; big update from 10 results, 8 packages to 69 results, 34 packages

* minor changes and updated ggplot2 dets

* revised some links and updated badges

* revised more language, formatting

* more language, formatting, punctuation

* add back in prereq code

Co-authored-by: Robin <[email protected]>

Author: engineerchange