build: release v1.0.0-rc1 with update docs

[dongsam]

Summary

Soon, v1.0.0-rc1 of Farming and Budget will be released, and demo doc needs to be updated to suit that version.

Tasks

• Apply address query of https://github.com/tendermint/budget/issues/89 to explain derive budget addresses
• Add changelog
• Update demo and how-to docs
• Release v1.0.0-rc1

References

• https://github.com/tendermint/farming/blob/main/docs/Tutorials/demo/budget_with_farming.md
• https://github.com/tendermint/budget/issues/89
• https://github.com/tendermint/budget/pull/88

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