(chore)readme: link the arch diagram & update docs (#80)

* (chore)readme: link the arch diagram

Signed-off-by: ksatchit <karthik.s@harness.io>

* (chore)docs: update the release notes

Signed-off-by: ksatchit <karthik.s@harness.io>

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Signed-off-by: ksatchit <karthik.s@harness.io>