Remove references to docker

[mcasperson]

---

Background

On-prem systems likely won't have docker, so we need to source the binaries directly from GitHub instead.

Results

The steps no longer pull and run docker images. Instead, they download and run the binary files directly.

Pre-requisites

• [x] Id should be a GUID that is not 00000000-0000-0000-0000-000000000000
  • NOTE If you are modifying an existing step template, please make sure that you do not modify the Id property (updating the Id will break the Library sync functionality in Octopus).
• [x] Version should be incremented, otherwise the integration with Octopus won't update the step template correctly
• [x] Parameter names should not start with $
• [x] Step template parameter names (the ones declared in the JSON, not the script body) should be prefixed with a namespace so that they are less likely to clash with other user-defined variables in Octopus (see this issue). For example, use an abbreviated name of the step template or the category of the step template).
• [x] LastModifiedBy field must be present, and (optionally) updated with the correct author
• [x] The best practices documented here have been applied
• [ ] If a new Category has been created:
  • [ ] An image with the name {categoryname}.png must be present under the step-templates/logos folder
  • [ ] The switch in the humanize function in gulpfile.babel.js must have a case statement corresponding to it

Fixes # . If there is an open issue that this PR fixes add it here, otherwise just remove this line

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: mcasperson
:x: Matthew Casperson

---

Matthew Casperson seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[mcasperson]

I mistyped my email address and now one of the commits is blocked by the CLA. I'll close this PR and recreate it.