remove openmm_rbfe notebooks

[atravitz]

resolves #251

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👈 Launch a Colab session on branch maint/delete_unused_nbs

[atravitz]

tests are failing for reasons that will be addressed in #268

[dwhswenson]

@atravitz @IAlibay This change means that installs of OpenFE without OpenFreeEnergy/openfe#1732 fail when running openfe test (and I don't think that PR has been included in a release yet). Can we either temporarily resurrect these notebooks or cut a patch release? Someone following the OpenFE install instructions will currently get failing tests. (Getting this on AMI builds now.)

[atravitz]

@dwhswenson yes we're aware of this and we're cutting a v1.8.0 release today. fetch rbfe-showcase isn't anywhere in our user-facing functionality, but I realize failing tests is a nuisance. is resolving this within 24 hours okay for you?