FRONT-744: Remove yarn

[bearni95]

Doesn't seem to be a behavior that's trivial to alter:
vercel/next.js#10642 (comment)
vercel/next.js#10647

[linear]

FRONT-744 Remove yarn dependencies in favor of NPM

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[its-edmund]

Are we making the switch to npm?

[kare]

package-lock.json is missing

[kare]

kkn@kare-mbp ~/src/github.com/streamr-dev/streamr-chat FRONT-744  % git grep yarn
.gitignore:yarn-debug.log*
.gitignore:yarn-error.log*
README.md:yarn dev

Replace/remove existing references to Yarn.