Clean up and add docstrings (#539) · JuliaInterop/RCall.jl@12fdd5b

removing `stable` and linking `stable` to `v0.14.4`.

removing `v0.14` and linking `v0.14` to `v0.14.4`.

removing `v0.13` and linking `v0.13` to `v0.13.18`.

removing `v0.12` and linking `v0.12` to `v0.12.1`.

removing `v0.11` and linking `v0.11` to `v0.11.0`.

removing `v0.10` and linking `v0.10` to `v0.10.6`.

removing `v0.9` and linking `v0.9` to `v0.9.1`.

removing `v0.8` and linking `v0.8` to `v0.8.1`.

removing `v0.7` and linking `v0.7` to `v0.7.5`.

removing `v0.6` and linking `v0.6` to `v0.6.4`.

Consider using `julia-actions/cache` to speed up runs https://github.com/julia-actions/cache. To ignore, set input `ignore-no-cache: true`

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