feat: switch from npm to yarn (#500)

* feat: switch from npm to yarn

* fix: build

* fix: replace yarn run with yarn

* fix: nodejs version install in Docker image

* fix: initialize mobx state

Co-authored-by: Karol Sójko <karolsojko@gmail.com>

.github/workflows/prod.yml

@@ -18,10 +18,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --pure-lockfile
 
       - name: Typescript
-        run: npm run tsc
+        run: yarn tsc
 
   deploy: