Accounts page revamp

[argaen]

Currently we are only showing the accounts tree. We should display some useful information like:

• accounts tree (collapse/etc and navigate to specific page).
• income/expenses graph
• net worth graph
• Assets radar with percentages of which assets contribute to it.
• small widget with last transactions

[argaen]

Accounts tree was added in https://github.com/maffin-io/maffin-app/pull/108

[argaen]

An easy one would be to add radar percentages for first level of Expenses/Income/Assets, etc.

Another one would be to calculate total net worth currently (accumulate in root account?).

Note that we have things a bit incorrect as we are calculating totals with only today's exchange rate. When time charts are added we will see how we deal with this -> i.e. stocks for sure are going to be incorrect. For normal expenses/income, it's going to be incorrect when we have accounts with different currency.

PS: Actually, current totals are already wrong as for expenses/income that are in a different currency we should be using the exchange rate for when the transaction happened.

[argaen]

Added net worth in #112

(note the totals are calculated with the value of of current day exchange rates and not of that specific date, we could improve this in the future).

[argaen]

A simple one to add is "latest movements" to have a quick view of latest transactions happening, maybe show the latest 5 or something like that.

[argaen]

After all the changes above, home page currently includes the following:

• account tree table navigation with totals
• net worth donut chart
• net worth bar chart
• latest movements
• expenses histogram
• income histogram

Closing this for now as it feels quite complete