Update install.sh to find the right files

[Olivia5k]

It seems that the file paths for the manifest and host files have changed and install.sh was not updated to match this.

[maximbaz]

Hey @thiderman, I think the reason install.sh is using chrome-host.json and others is because it is expecting that make static-files has been run on the repo. However, since make static-files is only doing files copy and nothing else, I don't really see the benefit of it, and I like your approach better.

Could you therefore also cleanup the static-files goal from makefile?

[maximbaz]

I ended up doing this myself as I was editing that file anyway - thanks for the contribution!

[maximbaz]

FYI the paths were correct and I ended up reverting the change in 45374cd as it broke release archives.

The missing puzzle piece was that when you run ./install.sh from source code, you have to go through the build steps described in CONTRIBUTING.md. Specifically, the step make release will ensure the presence of all the files needed by install.sh.