Replace www erlang links

[eksperimental]

First take on #66, let's see what Netlify finds

[netlify[bot]]

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[eksperimental]

@garazdawi please have a look at the changes in commit 5df2f80b17f0868f4b50fcfcafe01996de4d4fe8

[eksperimental]

@garazdawi please have a look now. What I have done is link everywhere to https://www.erlang.org and the _redirects file is the single source of truth to redirect to https://erlang.org.