Move repository to qutip.org

[ytdHuang]

@albertomercurio Here is a summary for the things we need to address after moving the repository into qutip.org. Let me know if there are other things we need to do.

TODO list:

• [x] Not sure whether we should change the author in Project.toml as qutip develop team or something else
• [x] Modify the links and authors in docs/make.jl
• [x] Modify the links in docs/src/benchmarks/benchmark_history.md
• [x] Modify LISENCE (should we change to the similar LISENCE as qutip ?)
• [x] Modify all the badges' links in README.md
• [x] Deal with codecov and check whether secrets.CODECOV_TOKEN still works
• [x] Check whether secrets.GITHUB_TOKEN still works
• [x] Check whether secrets.DOCUMENTER_KEY still works
• [x] Change repo link in General
• [x] Check whether Package registration and automatic documentation build for version releases still work
• [x] Check whether Benchmark Track still works
• [x] #40

[ytdHuang]

@albertomercurio I think we can close this issue.