Update instructions for new macOS guidance and drop source install for now

[dannycjones]

In summary, this PR reworks the installation instructions in two ways.

Firstly, it drops the installation from source instructions, with the intention to add an updated version back once working. As #696 mentions, go install should be used instead of go get now. In terms of getting go install working, I'm seeing the same issues as #527, #664.

Secondly, it updates the instructions now that goofys is not available from Homebrew. This is due to a licensing change on the FUSE library used on macOS. Addresses #628.

Note, this does overlap with #618, #668, #687 but they do not address that goofys can no longer be installed via Homebrew (see Homebrew/homebrew-core#64491).

(closes #618, #668, #687)

[monthonk]

Looks good, thanks Danny.

[dannycjones]

If #680 is merged before this, I think we can re-introduce the building from source options subject to testing.

[dannycjones]

Closing. Change is outdated and Homebrew is no longer a supported method for install FUSE dependent connectors on macOS.