IPV6 NginX support

[caronc]

Description:

Related issue (if applicable): refs #127

Update Nginx configuration so that it works with both ipv4 and ipv6

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] Tests added

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (beade2b) 94.97% compared to head (c12b436) 94.97%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #129 +/- ## ======================================= Coverage 94.97% 94.97% ======================================= Files 15 15 Lines 1433 1433 ======================================= Hits 1361 1361 Misses 72 72 ```

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