Added currency formatting and loading screens for home page

So I made a function that turns the currency value into a formatted string, and shows a ‘+’ on income in the transaction list and no sign on expenditure.

Then I made a loading wheel for the home page - you don’t really see this because it is only shown when it is checking if you are authenticated with your bank.

I improved the design for the ‘not connected’ screen, and I stole the design for the link from one of my other projects because it looks pretty cool.

And finally I made a skeleton loader for the accounts page, which is shown while the accounts are loading. The areas where the data would be are replaced by pulsing grey boxes, which is a modern approach to showing loading data.

Overall I think these changes made the site look more professional!