Fix link to contributing and typos

[iranzo]

Fix typos on the 'website' part of index pointing to invalid CONTRIBUTING

[openshift-ci]

Hi @iranzo. Thanks for your PR.

I'm waiting for a redhat-et member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[fzdarsky]

/ok-to-test
/approve

[openshift-ci]

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