Fix BOC UI από Dimitris

## What is this?
An opinionated attempt to make the UI/UX of the new BOC web app more humane.

## Is it safe to use?
This add-on only works when you visit the online web app of BOC. It makes changes to the CSS code of the website which affects how the information is displayed on your screen. No information is accessed, altered or shared.

## Features
- Auto re-news your session, so you can actually work without suffering an existential crisis. (max ~1hour)
- Moves the account list to the right sidebar, giving you more visible space for the things you need
- Makes the transactions table consume the full width of your screen
- Makes the description of a transaction always visible