Eng 21257 perf graphs (#937)
Eng 21257 perf graphs (#937)


* ENG-21257 flatten performance graphs, use google gplot instead of matplotlib, break graphs into groups

* remove matplot references

* add a Security Policy Directive

* main page should be prefix-index.html

* disable security context section

* make paths more relative, don't support prefix anymore. add failures to the graph heading

* distinguish between warnings

* use light red for warnings, print correct pct value when getting a warning

* when you click on a point, go to the github commit history for that branch

* add link to wiki for help

* add event links to legends and line graphs, add links back to other graphs

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