Remove unused dependencies (#116)

## Motivation for the change, related issues

We have a lot of dependencies which makes upgrading difficult. See #106
for more context. This PR removes the ones that seemed unused and moves
a few entries over to the devDependencies list.

After this PR, we could see which deps give us the most headache and
look into removing them in one way or another.

## Testing Instructions (or ideally a Blueprint)

Cross your fingers and wait for CI.

---------

Co-authored-by: Brandon Payton <[email protected]>
Co-authored-by: Wojtek Naruniec <[email protected]>
Co-authored-by: Bero <[email protected]>

Author: 4 people

.eslintrc.json

@@ -1,7 +1,7 @@
 {
 	"root": true,
 	"ignorePatterns": ["**/*"],
-	"plugins": ["@nx", "playground-dev", "erasable-syntax-only"],
+	"plugins": ["@nx", "playground-dev"],
 	"overrides": [
 		{
 			"files": ["*.ts", "*.tsx", "*.js", "*.jsx"],