Integrate supabase for event/project data and images to supabase

[ehrelevant]

Currently, event/project data is still stored as JSON files in the repository, while images for both are not being hosted anywhere. These should be moved to the Supabase instance created for this website as part of #158. The data and images gathered in #154 should also be included in this transfer.

Additionally, these need to be properly integrated into the application. This means that the models, data fetching, and data processing should be updated to remove obsolete steps related to parsing the JSON. We should also aim to make further optimizations by making full use of the increased capabilities provided by SQL operations.

[mortrpestl]

Good day!

On tasks #3 and #4 (assigned to me):

(Task 3)
Looking at the member data (from Task 2) and cross-checking, I didn't observe any discrepancies or potentially unsafe member pictures in the storage.

(Task 4)
I have also added (from #158) in the online Supabase instance.:

• the relevant events photos
• imported the CSV containing the events data

You can view these in events-photos storage and the events database.

For reference, the next step to take (I assume this is part of #2) for this part of the website update is the integration of these events and photos to the application (by updating the data fetching methods). I hope this issue helps with the raw data necessary for testing and connecting the events to the website.

Thank you!