teach users to run inference app locally

[rccreswell]

We link to the app landing page in the first section of the 2022 paper (and some other places I have recently mentioned this...) so I think we should try and avoid having a flagrant broken link from the heroku.

Obviously it would be ideal to do another deployment, but as a makeshift solution I would suggest just instructing them how to run the app locally using the package, which is what this PR implements, but happy to hear any other suggestions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f7f43ef) to head (d46e099).

Additional details and impacted files

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##              main      #236   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           13        13           
  Lines         1174      1172    -2     
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- Hits          1174      1172    -2     

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[FarmHJ]

In the index.html file, it is not clear which link you are referring to in "see Github link below". Also, we could emphasise that this method is used to run the app locally by making a minor change to 'To access the app locally in your browser'.

[rccreswell]

In the index.html file, it is not clear which link you are referring to in "see Github link below". Also, we could emphasise that this method is used to run the app locally by making a minor change to 'To access the app locally in your browser'.

Thank you for your suggestions, I reordered it to hopefully be slightly clearer

[FarmHJ]

Looks good.