I was trying to show how much disk space Prometheus was using and
couldn't find good answers.

donate: rewrite activity diagram to clarify the perk data workflow

See merge request !66

It wasn't clear to me exactly what was going on with those
notes. Ideally, we'd also find a way to automate that synchronization
process (as mentioned above), so it feels better to make an actual
arrow there, even though it doesn't fully reflect the way this
actually works underneath.

I also feel it looks *much* better to move the CiviCRM column to the
left.

See: tpo/web/donate-neo#79

/assign_reviewer @stephen

Closes: tpo/web/donate-neo#79

this was postponed from 2024 and seems relevant

Major documentation updates made to:
- Design and architecture
  - Written description regarding how and why donate-neo design diverged between initial planning and execution
  - Mermaid diagrams outlining both DI-driven data relationships between Django apps and user donation checkout flow
- Technical debt, outlining the friction between donate-neo's PII minimal handling and Stripe Radar's fraud detection algorithm

Minor documentation updates made to:
- Queues, regarding the custom Resque handler and PayPal IPN handling
- Interfaces, regarding PayPal IPN handling
- Implementation, clarifying that CSS and JS are managed via NPM rather than NVM (which itself simply manages local NPM versioning)
- Tests, listing the command for running unit tests

also add a wildcard to the suggested find command so that it matches
things like `hostname.torproject.org.yaml`

Found in team#41977

We also explicitly check for None, instead of assuming truth value,
this allows a user to pass "" as a username if they *really* want to
shoot themselves in the foot.

As per the TPA roadmap meeting of Jan 13 2025, we'll "adopt
TPA-RFC-73 as a general guide / rough plan and review as we go".

See: https://gitlab.torproject.org/tpo/tpa/team/-/wikis/meeting/2025-01-13

refs team#41721

also show an example to query by parameter value

This is the most likely scenario so it should appear first in the
documentation.

I've also modified the example command for running non-ganeti reboots so
that it directly launches the reboots and it automatically excludes
ganeti nodes.

the options were renamed to include the unit type (e.g. minutes or
seconds)

If I just copy/paste the examples from this page, I get an error like
this:

    No idea what 'perdulce.torproject.org' is!

This is because the last sed command in subshells that fetch information
is not doing what it should since output is separated by newlines
instead of spaces. With `paste` we can make this work better.