[docs] switch generated docs to MkDocs

docs/api/eigensolvers.md

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+# eigensolvers
+
+::: meanas.eigensolvers

docs/api/fdfd.md

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+# fdfd
+
+::: meanas.fdfd
+
+## Core operator layers
+
+::: meanas.fdfd.functional
+
+::: meanas.fdfd.operators
+
+::: meanas.fdfd.solvers
+
+::: meanas.fdfd.scpml
+
+::: meanas.fdfd.farfield

docs/api/fdmath.md

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+# fdmath
+
+::: meanas.fdmath
+
+## Functional and sparse operators
+
+::: meanas.fdmath.functional
+
+::: meanas.fdmath.operators
+
+::: meanas.fdmath.vectorization
+
+::: meanas.fdmath.types

docs/api/fdtd.md

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+# fdtd
+
+::: meanas.fdtd
+
+## Core update and analysis helpers
+
+::: meanas.fdtd.base
+
+::: meanas.fdtd.pml
+
+::: meanas.fdtd.boundaries
+
+::: meanas.fdtd.energy
+
+::: meanas.fdtd.phasor

docs/api/index.md

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+# API Overview
+
+The package is documented directly from its docstrings. The most useful entry
+points are:
+
+- [meanas](meanas.md): top-level package overview
+- [eigensolvers](eigensolvers.md): generic eigenvalue utilities used by the mode solvers
+- [fdfd](fdfd.md): frequency-domain operators, sources, PML, solvers, and far-field transforms
+- [waveguides](waveguides.md): straight, cylindrical, and 3D waveguide mode helpers
+- [fdtd](fdtd.md): timestepping, CPML, energy/flux helpers, and phasor extraction
+- [fdmath](fdmath.md): shared discrete operators, vectorization helpers, and derivation background
+
+The waveguide and FDTD pages are the best places to start if you want the
+mathematical derivations rather than just the callable reference.

docs/api/meanas.md

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+# meanas
+
+::: meanas

docs/api/waveguides.md

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+# waveguides
+
+::: meanas.fdfd.waveguide_2d
+
+::: meanas.fdfd.waveguide_3d
+
+::: meanas.fdfd.waveguide_cyl