Document the components that make up BuildGrid

This commit adds some high level user documentation of the various
components that make up a BuildGrid deployment.
6 jobs for sotk/documentation/components in 12 minutes and 51 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed documentation #540488018

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passed dummy-tests #540488015

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passed e2e-tests #540488017

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passed type-check #540488013

00:08:11

passed unit-tests #540488011

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  Post
passed coverage #540488020

00:01:28

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