Suggested fixes for Mac x Firefox toolchain pkg download

[LiveMethod]

Since there's no PR feature for wiki pages, two things:

1. Firefox .pkg download for the toolchain does continue to work if you right click save as. Propose revising the note in https://github.com/electro-smith/DaisyWiki/wiki/1b.-Installing-the-Toolchain-on-Mac to read _Note: Firefox changed their default download behavior (Nov 2023), so you need to right click and "Save Link As" or use Chrome to install the toolchain. The ES team will be troubleshooting this._

2. Fixing the underlying issue:
   The only relevant headers I see on that .pkg download are type and encoding. Firefox uses content-disposition to manage DL actions. Consider adding the header Content-Disposition: attachment; filename="DaisyToolchain-macos-installer-x64-0.2.0.pkg" and see if that sorts it out. Since it looks like it's hosted on DO, here's their relevant docs.