Remove immer package (Kwenta#1718)

* Bump immer from 9.0.6 to 9.0.16

Bumps [immer](https://github.com/immerjs/immer) from 9.0.6 to 9.0.16.
- [Release notes](https://github.com/immerjs/immer/releases)
- [Commits](immerjs/immer@v9.0.6...v9.0.16)

---
updated-dependencies:
- dependency-name: immer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* remove immer package

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: platschi <platschi@posteo.org>

README.md

@@ -19,7 +19,6 @@ The latest IPFS hash can be found under [releases](https://github.com/Kwenta/kwe
 - Recoil
 - Unstated-next
 - Styled-Components
-- Immer
 
 ## Ethereum stack