v1.4.0

Lux v1.4.0

Diff since v1.3.4

Merged pull requests:

• ci: use sources for docs (#1100) (@avik-pal)
• Add Reactant and TPU to autodiff.md (#1101) (@wsmoses)
• refactor: cleanup some old pre-1.0 hacks (#1102) (@avik-pal)
• feat: add bf16 function (#1104) (@avik-pal)
• docs: add CUDA.CURAND.default_rng() to docs (#1105) (@avik-pal)
• fix: use generic broadcasting for complex numbers (#1106) (@avik-pal)

Closed issues:

• Zygote + ForwardDiff support for complex differentiation (#977)
• Add CUDA.CURAND.default_rng() to the table (#1003)