feat(bash/bashrc): let `nvm` create a `current` symlink
feat(bash/bashrc): let `nvm` create a `current` symlink

Setting the `NVM_SYMLINK_CURRENT` environment variable to `true` enables
`nvm` to create a `current` alias under the `~/.nvm` directory every
time the `npm run` command is executed. The alias points to the
currently active Node.js runtime whose full path is
`~/.nvm/versions/node/v[major].[minor].[patch]/bin/node`.

See the description below, which is an extraction from the `nvm` GitHub
repo:

> `nvm` use will not, by default, create a "current" symlink. Set
> `$NVM_SYMLINK_CURRENT` to "true" to enable this behavior, which is
> sometimes useful for IDEs. Note that using `nvm` in multiple shell
> tabs with this environment variable enabled can cause race conditions.

See: https://github.com/creationix/nvm#listing-versions

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