update the budget for 2021-2022

totally forgot about this, but we have a budget. it's currently in "Budget Sysadmin.xls" in the sysadmin share, but I think it should be folded inside the Tor VM spreadsheet to (a) get more visibility and (b) get some automatic calculations done, because the latter spreadsheet already has the per-server cost.

we need to:

• merge the budget and Tor VM Hosts.xlsx spreadsheets so that we have all numbers in one place
• ask sue for up to date numbers on our "income" (how much money we have to spend), "expenses" (how much we're spending, particularly in Riseup and Hetzner, but basically eveyrthing)
• update spreadsheet based on sue's numbers
• establish what our emergency buffer is it's basically: just ask for approval
• plan for expansion in the next year (this needs coordination with the roadmap work, see #40307 (closed) and others)