Remove /.binder

[1ucian0]

This PR removes the folder .binder, as we dont use it for image testing anymore.

[qiskit-bot]

One or more of the following people are relevant to this code:

• @Qiskit/terra-core

[mtreinish]

We still have the image tests here: https://github.com/Qiskit/qiskit/tree/main/test/visual and they run in CI, for example: https://github.com/Qiskit/qiskit/actions/runs/19707092958/job/56457401076 Are we dropping those? Also there are contributing docs on using binder here: https://github.com/Qiskit/qiskit/blob/main/CONTRIBUTING.md#snapshot-testing-for-visualizations

[coveralls]

Pull Request Test Coverage Report for Build 19708483411

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 19 unchanged lines in 3 files lost coverage.
• Overall coverage remained the same at 88.413%

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Files with Coverage Reduction	New Missed Lines	%
crates/circuit/src/parameter/symbol_expr.rs	2	72.94%
crates/qasm2/src/lex.rs	5	92.03%
crates/qasm2/src/parse.rs	12	97.09%

Totals
Change from base Build 19706858572:	0.0%
Covered Lines:	94506
Relevant Lines:	106892

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💛 - Coveralls