Update documentation content

[brunomenezes]

Documentation issue

• Documentation improvement

Is there a specific documentation page you are reporting?

It is an update to align with Cartesi's new branding. The screenshots used in the tutorials for staking use the previous branding colours. We also want to include an embedded video shared by the marketing team.

Video to be embedded: https://www.youtube.com/watch?v=7VAYt3qHpSI

The video should be embedded in the staking section under the title "How to Stake"

URL to be updated:

• https://docs.cartesi.io/earn-ctsi/staking/
• https://docs.cartesi.io/earn-ctsi/run-node/
• https://docs.cartesi.io/earn-ctsi/public-pool/

Additional context or description

The tutorial documentation is located in the Cartesi documentation repo under docs/earn-ctsi

[nevendyulgerov]

PR for this is https://github.com/cartesi/docs/pull/181.

[nevendyulgerov]

The above ☝️ PR was merged, so we can close this one.