Add minimal documentation for v0.2 (#105)

* Add barebones documentation

* Don't check exports

docs/Project.toml

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+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"

docs/make.jl

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+using Documenter
+using AdvancedVI
+
+# Doctest setup
+DocMeta.setdocmeta!(AdvancedVI, :DocTestSetup, :(using AdvancedVI); recursive=true)
+
+makedocs(;
+    sitename="AdvancedVI",
+    pages=[
+        "Home" => "index.md",
+        "API" => "api.md",
+    ],
+    doctest=false,
+)
+
+deploydocs(; repo="github.com/TuringLang/AdvancedVI.jl.git", push_preview=true)

docs/src/api.md

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+## API
+
+```@docs
+vi
+ADVI
+```

docs/src/index.md

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+# AdvancedVI
+
+[AdvancedVI](https://github.com/TuringLang/AdvancedVI.jl) provides implementations of variational Bayesian inference (VI) algorithms.
+VI algorithms perform scalable and computationally efficient Bayesian inference at the cost of asymptotic exactness.
+`AdvancedVI` is part of the [Turing](https://turinglang.org/) probabilistic programming ecosystem.