Remove tutorials

[frankharkins]

Summary

This PR removes all tutorials from this repo. Most were recently migrated to Qiskit/documentation in Qiskit/documentation#1149 and I believe the others are no longer hosted anywhere.

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[coveralls]

Pull Request Test Coverage Report for Build 8691089615

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on FH/remove-tutorials at 83.617%

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Totals
Change from base Build 8690958781:	83.6%
Covered Lines:	6237
Relevant Lines:	7459

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💛 - Coveralls