Just in case anyone is interested: I've updated the website again. Although it's questionable if the website will ever come online, it's just a nice learning experience for me 
It's difficult to show the new things when the website is just locally on my PC, but one of the major things I've added is a file-detail page aside from the set-detail page. A set page shows some basic information about the set and all files in the database for that set. A file page shows a specific file and its information. At the moment there's also a blank area where either a generated image of the file should come or a browser-based viewer (I've tried Brigl, but I couldn't get it to work). The file-detail page also shows the file header. Although I think the header doesn't have much use, it does look nice
It's difficult to show the new things when the website is just locally on my PC, but one of the major things I've added is a file-detail page aside from the set-detail page. A set page shows some basic information about the set and all files in the database for that set. A file page shows a specific file and its information. At the moment there's also a blank area where either a generated image of the file should come or a browser-based viewer (I've tried Brigl, but I couldn't get it to work). The file-detail page also shows the file header. Although I think the header doesn't have much use, it does look nice