Try to fix the build

Buidler is very fragile when used in monorepos:
NomicFoundation/hardhat#468
NomicFoundation/hardhat#532
NomicFoundation/hardhat#570

Let's try using roderik's workaround from here again:
NomicFoundation/hardhat#468

Unfortunately this breaks create-react-app, so try to work around
that by nohoisting the entire dev-frontend package.

Now we need to keep an eye on this problem, because it seems to
occur sometimes:
yarnpkg/yarn#4563

:S

package.json

@@ -9,7 +9,10 @@
       "**/mocha",
       "**/@nomiclabs/*",
       "**/*buidler*",
-      "**/solidity-coverage"
+      "**/solidity-coverage",
+      "**/ts-node",
+      "**/typescript",
+      "@liquity/dev-frontend/**"
     ]
   },
   "scripts": {