Adding Tarmak high level overview diagram

[simplyzee]

What this PR does / why we need it:
A high level overview cloud architectural diagram for Tarmak added to the documentation to give a broad overview of the components within Tarmak.

Release note:

NONE

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[simonswine]

Good work really like it, maybe add the source file (xml, svg) to it and I am happy

[simplyzee]

Good work really like it, maybe add the source file (xml, svg) to it and I am happy

Thanks! I've added the XML source file to the existing PR.

[simplyzee]

/assign @mattbates

[jetstack-bot]

@zee-ahmed: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
tarmak-puppet-module-tarmak-acceptance-1-14-centos	7b3bd67	link	/test puppet-tarmak-acceptance-centos v1.14

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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