Add the missing assets build step to the page on how to develop custo…

[maxocub]

…m fields

:heart: Thank you for your contribution!

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[fenekku]

Ugh, new version of mkdocs / dependency out. I will take care of it soon.

[fenekku]

I had to push to your master branch @maxocub to fix the issue. Sorry about that!

But the issue is fixed. Thanks again!