feat: Added offline availability with service workers

[Resaki1]

Closing issues:

• Closes: feat: Offline availability #217

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Describe your work, what changed

Added the next-pwa plugin, which auto generates a service worker based on a config. This service worker can cache HTTP requests, which allows the site to be responsive even with slow or no network connection (as long as the requested parts of the site have been cached).

Additionally, I had a bug where visiting the site to create a cocktail wasn't possible when I didn't have any cocktails in the database. Was a simple fix.

Affected sites (please check during review):

all

Further comments

Explanation of the runtime caching config:

1. All requests regarding the queue are set to NetworkOnly. This means, they are never served from cache, as that would create bugs.
2. All other GET requests are set to StaleWhileRevalidate. This means, the service worker will always first check the cache and serve the response from there, if available. At the same time, the service worker will check the network (if available). If the data received over the network is newer than from cache, the data will be updated on the client and in the cache. Cache is kept valid for 14 days.

• Queue requests are never served from cache, because the client always needs the newest information from the server. I couldn't find other cases where GET requests should never be cached, if you can think of one please let me know.
• All other request types (POST etc.) are obviously not cached. In a next step, we could disable buttons that trigger these requests while the client has no connection to the server (and maybe show some kind of 'offline' indicator)
• This is the first step towards a PWA, but additional steps are required (mainly a manifest.json and some screenshots). I'd be happy to do that in another PR later.

Demo

Here is a video showing the functionality. First, some parts of the site are visited with normal network connection. These are automatically cached. Then, the network connection is turned off, and the cached parts of the site still work fine. Things like the queue or adding cocktails to the statistics obviously don't work while offline.

CocktailManagerOffline.mov

[jo-gross]

Looks really great and improves the usability a lot. Even though in firefox its not working as great as in chrome, it makes a huge upgrade. I´m greatful for any more contribution, that helps a lot!

In the long term future it would be awesome to make the "queue" and "track" fuctionality also offline available and push the results when reconnecting.

[jg-semantic-release-bot]

🎉 This PR is included in version 1.9.0 🎉

The release is available on:

• GitHub release
• v1.9.0

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