Fix automated actions

[Ericgig]

Action (nightly / tests) have been failing for a while for multiple issues:

• A link in v4's tutorial work on a browser, but not with the test. Maybe the site has a bot blocker? I disabled this check.
• Removed the check for only new links. It still test all links thus failed unrelated to the PR. The non-blocking check for all links is still there.
• Install directly from github and let pip install dependencies automatically. This seems to be the most stable

With this, test passes for v4, fail for v5, but it seems related to qutip/qutip#2308, thus a true bug in the notebook, not an issues with the github actions. For v5, it runs without cython (filelock is not a requirement), but adding it breaks some notebooks... We should investigate it later.

Also removed deprecated use of svn to fetch website files.

[Ericgig]

The fix for the failing test for v5 is in qutip/qutip#2336.