update the link of the qutip idea page

README.md

@@ -13,7 +13,7 @@ The qutip-qip package, QuTiP quantum information processing, aims at providing b
 Compared to other libraries for quantum information processing, qutip-qip puts additional emphasis on the physics layer and the interaction with the QuTiP package.
 The package offers two different approaches for simulating quantum circuits, one with `QubitCircuit` calculating unitary evolution under quantum gates by matrix product, another called `Processor` using open system solvers in QuTiP to simulate noisy quantum device.
 
-If you would like to know the future development plan and ideas, have a look at the [discussion panel](https://github.com/qutip/qutip-qip/discussions) as well as the [qutip documentation for ideas](https://github.com/qutip/qutip-doc/tree/master/development/ideas).
+If you would like to know the future development plan and ideas, have a look at the [discussion panel](https://github.com/qutip/qutip-qip/discussions) as well as the [qutip documentation for ideas](https://qutip.org/docs/latest/development/ideas.html).
 
 Quick start
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