Update rust and use stable for benches (polkadot-fellows#574)

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We are trying to get the command bot working. However, right now it is
timing out when trying to build the runtimes plus the omni bencher after
6 hours. This should not take 6 hours ;) So, one guess is that maybe the
nightly is doing something that takes quite long to build. We want to
try the stable compiler and see if that fixes the issue.

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Co-authored-by: GitHub Action <action@github.com>

Lower Parachain and Data Deposits to Encourage Experimentation on Kus…

…ama (polkadot-fellows#501)

Chaos is a ladder, this PR proposes bringing the rungs a tad bit closer
to make it easier to climb.

In other words, this PR aims to lower the barriers for experimentation
and innovation within the Polkadot ecosystem. We're reducing both the
`ParaDeposit` and `DataDepositPerByte` to encourage more developers and
projects to deploy and test their ideas on Kusama.

The changes:

- Reduced ParaDeposit from 40 UNITS to 4 UNITS
- Lowered DataDepositPerByte from 1 CENT to 0.1 CENTS

These adjustments will make it more accessible for teams to register a
blockchain and get started. I think that making things accessible starts
with making them affordable, this aims to do just that. This aligns with
Kusama's role as a canary network, where we can push the boundaries of
what's possible.

While we're lowering the initial costs, it's worth noting that this
change **doesn't implement an adaptive fee structure** that would
increase costs if too much code is registered too quickly. Such a
mechanism could be considered for future implementations, potentially as
a Polkadot-ready solution.

Kusama is the playground for radical innovation. With these lowered
deposits, we're inviting chaos – controlled chaos that drives progress.

Expect the unexpected, and let's see what comes out the other end. :)

Explain approval rights (polkadot-fellows#42)

This also adds a tutorial on how to add the github name to the on-chain
identity.

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Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Przemek Rzad <roopert7@gmail.com>
Co-authored-by: André Silva <andrerfosilva@gmail.com>