Replace stage URL with prod URL on README

[northwestwitch]

This PR adds | fixes:

• Replace stage URL with prod URL on README page

How to test:

• NO tests needed, it's docs

Review:

• [ ] Code approved by
• [ ] Tests executed by

This version is a:

• [ ] MAJOR - when you make incompatible API changes
• [x] MINOR - when you add functionality in a backwards compatible manner
• [ ] PATCH - when you make backwards compatible bug fixes or documentation/instructions

[codecov-commenter]

Codecov Report

Base: 95.04% // Head: 95.04% // No change to project coverage :thumbsup:

Coverage data is based on head (caea36b) compared to base (fa84180). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ======================================= Coverage 95.04% 95.04% ======================================= Files 9 9 Lines 424 424 ======================================= Hits 403 403 Misses 21 21 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `95.04% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Clinical-Genomics#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Clinical-Genomics). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Clinical-Genomics)

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