Revisit contribution requirements

[housseindjirdeh]

When we started this project, Lighthouse only gave a score for PWA:

A lot has changed since, where scores are provided along multiple areas:

@developit brought this up and made a very good point. There are a few things we can do here:

• Allow contributions that meet a minimum score for PWA, Performance and Accessibility
• Allow contributes that meet an average score for PWA, Performance and Accessibility

Updating this will tie in well to updating all scores to LH 3.0 via #60. We also should update how we display the scores on the site (ideally showing all of them)

[jnorthrup]

actually tbh, I'm under the impression that the lighthouse requirements are turning simple and concise PWA's into steaming piles of last-minute tweaks to bump up a few points here and there, and may cause wanton sloppy rewrites of simple working code.

I have started mentioning this to node developers I work with and that they may get lucky and find informative code in older git revisions of these formula-1 race-day editions.

the case may also be that this is homogenizing the options of the backend and front-end and ruling out entire classes of approach. i have to say these are not the kind of PWA's (style, features, usecases) my customers are interested in.