Move bib plugin to pages.jl for JuliaAstro.org #485

Job	Run time
Aqua tests	39s
Aqua tests	39s
Documentation	58s
Documentation	58s
Julia 1.6 - ubuntu-latest - x64 - push	2m 40s
Julia 1.6 - ubuntu-latest - x64 - push	2m 40s
Julia 1.6 - macOS-latest - x64 - push	3m 20s
Julia 1.6 - macOS-latest - x64 - push	3m 20s
Julia 1.6 - windows-latest - x64 - push	15m 14s
Julia 1.6 - windows-latest - x64 - push	15m 14s
Julia 1 - ubuntu-latest - x64 - push	2m 8s
Julia 1 - ubuntu-latest - x64 - push	2m 8s
Julia 1 - macOS-latest - x64 - push	2m 11s
Julia 1 - macOS-latest - x64 - push	2m 11s
Julia 1 - windows-latest - x64 - push	2m 29s
Julia 1 - windows-latest - x64 - push	2m 29s
Julia nightly - ubuntu-latest - x64 - push	1m 34s
Julia nightly - ubuntu-latest - x64 - push	6m 23s
Julia nightly - macOS-latest - x64 - push	5m 6s
Julia nightly - macOS-latest - x64 - push	8m 14s
Julia nightly - windows-latest - x64 - push	2m 26s
Julia nightly - windows-latest - x64 - push	8m 16s
	1h 31m 17s

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