Make submit visible but disabled before input is given, fixes #677 #2940
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The main change I've made here is adding a 'disabled' styling to the DeprecatedButton component, which desaturates it and lowers the opacity, visually indicating that it's disabled.
Then within the ChallengePanel component I've made it so that the submit button appears disabled if no input has been given, appear enabled if input has been given, and disappear when the 'continue' button is available.
My reason for the latter part was that it allows users to press submit and then click again in the same place to continue, which is the natural next interaction.
I updated the feature files to reflect the new expected behavior.
(This is my first PR for LL, I really like the project, let me know if there's anything I should change)