feat: recombine the install script

[ericswanson-dfinity]

Description

This PR combines the individual files of the install script into a single file. Since it's easier to manage, this eliminates the need for a separate feature branch for the dfxvm install script. Instead, both install scripts are now stored as single files in public/.

• Combine public/install/*.sh from the master branch into public/install-dfx.sh
• Combine public/install/*.sh from the sdk-1278-dfxvm-install-script feature branch to public/install-dfxvm.sh
• Update the publish-manifest workflow to no longer strip comments and to publish both the dfx and dfxvm install scripts
• Remove the workflow that dealt with the sdk-1278-dfxvm-install-script feature branch

Part of https://dfinity.atlassian.net/browse/SDK-758

How Has This Been Tested?

• compared install-dfx.sh with output of curl -fsSL https://internetcomputer.org/install.sh. As expected, the only differences are the addition of comments.
• compared install-dfxvm.sh with output of curl -fsSL https://raw.githubusercontent.com/dfinity/sdk/dfxvm-install-script/install.sh. As expected, the only differences are the addition of comments.
• ran locally with sh -ci "$(cat install-dfx.sh)"
• ran locally with sh -ci "$(cat install-dfxvm.sh)"

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.