Clean up documentation

[jacobtomlinson]

• Cleaned up README and docs index
• Added Markdown example syntax
• Moved example to separate page
• Added a hello world chart to the docs to make the example clearer

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@bb5f61b). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #7   +/-   ##
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  Coverage        ?   73.97%           
=======================================
  Files           ?        6           
  Lines           ?      196           
  Branches        ?        0           
=======================================
  Hits            ?      145           
  Misses          ?       51           
  Partials        ?        0           

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