refactor(app-canary): monitor only a single GUID (#239)

* Refactor to only monitor a single canary GUID

* Move any CANARY_GUID errors from the API into a more user-friendly callout box instead of displaying in the table.

* Display monitoring results in a callout instead of a table

* Remove all great_tables use and references since we no display table data

* Always display the GUID when it generates an error response from the content API

* Refactor to reduce code HTML duplication

* Additional code consolidation and deduplication

* Additional code consolidation, remove pandas

* Further refactoring to tidy up the code for efficiency

* Minor wording change on setup instructions.

Author: cgraham-rs