docs: Service Workbench installation guide

[shyogesh-sw]

Issue #, if available: GALI-988

Description of changes: New Service Workbench installation guide

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?
• Have you successfully tested with your changes locally?
• If new dependencies have been added, have they been pinned to specific versions?
• Is this change also required on the AWS Solution version?
• Have you updated openapi.yaml if you made updates to API definition (including add, delete or update parameter and request data schema)?
• If you had to run manual tests, have you considered automating those tests by adding them to end-to-end tests?

AS review ticket id:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #545 (4d961b8) into develop (b202080) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #545   +/-   ##
========================================
  Coverage    49.04%   49.04%           
========================================
  Files          243      243           
  Lines        12503    12503           
  Branches      2014     2014           
========================================
  Hits          6132     6132           
  Misses        5564     5564           
  Partials       807      807           

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[SanketD92]

LGTM

[shyogesh-sw]

The new SWB installation guide is now published.