update README to reflect changes in Tauri and rust projects

[alf5]

A bit of feedback:
This project looked interesting and wanted to check it out. Currently there is a problem cloning it.
There are a couple of doc errors and, maybe, an installation error.

1. tuari.studio site is no longer used for docs. "This repository has been archived by the owner on May 23, 2020."
2. cargo install produces the error:
   error: Using cargo installto install the binaries from the package in current working directory is no longer supported, usecargo install --path .instead. Usecargo build if you want to simply build the package.
   • this should be updated to reflect the intended actions.
   • if the intended action is cargo install --path . then it currently produces an error :(

[dancixx]

@alf5 thanks for reporting this. I have updated this part of the readme.md. Please let me know if you have any further issues.