Improve docs for SC5 Docker set-up

[ab91]

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Description

• Adds bash script with comments detailing each command.
• Clarifies env var value assignments with clear placeholders, examples, notes
• Minor language adjustment around specifying arguments

Motivation and Context

These changes makes Sauce Connect 5 setup a little bit easier for new Sauce Connect 5 users.

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation fix (typos, incorrect content, missing content, etc.)

[ab91]

Just fyi @mfranzonello2

[mmatczuk]

Please fix the build @ab91

[mmatczuk]

@ab91 can you please rebase.

[ab91]

@mmatczuk would you like the revisions? If the revisions are stale or unwanted, I'll just close the PR instead of rebasing for proper merge.

[mmatczuk]

Left some comments. Overall the change is legitimate.

[ab91]

Thoughts @mmatczuk?

[mmatczuk]

Thanks @ab91 for the contribution. I'm closing this as now we use sth like

docker run \
  -e SAUCE_USERNAME="<usename>" \
  -e SAUCE_ACCESS_KEY="<access-key>" \
  -e SAUCE_REGION="<region>" \
  -e SAUCE_TUNNEL_NAME="<tunnel-name>" \
  saucelabs/sauce-connect