Update Relayer Docs

[shekohex]

Summary of changes

• Adds a Quick Start page

Proposed area of change

Put an x in the boxes that apply.

• Overview
• Anchor System
• dApps
• Tangle
• Protocols
• Relayers

Reference issue to close (if applicable)

• Relates to [TASK] Relayer | Review and simplify setup/usage instructions #71
• Closes [TASK] Improving relayer documentation relayer#366
• Depends on Update Relayer configration docs and Examples relayer#369

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Code Checklist

• I have tested that prove my changes are working as intended
• I have added necessary documentation (if appropriate)

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[dutterbutter]

LGTM !! Thank you.

I edited the PR summary to indicate related to #71 and not close as it would still be good to go through and improve / update the docker and systemd related docs for running a relayer.

[shekohex]

I edited the PR summary to indicate related to #71 and not close as it would still be good to go through and improve / update the docker and systemd related docs for running a relayer.

Indeed, I will work on those next, in another PR(s)