Remove bundlesize from list of devDependencies

bundlesize has some indirect dependencies which require extra build
time. Currently, it is only used for CI, so the extra time required to
build/install is unnecessary for most use cases.

Instead of installing bundlesize alongside Auspice, install it through
npx where it is used. Installing through npx installs to a folder in the
npm cache.

.github/workflows/ci.yaml

@@ -69,7 +69,11 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: npm ci
-      - run: npx bundlesize
+      # Node.js 14 comes with NPM 6 which auto-installs packages by default.
+      - if: ${{ matrix.node == 14 }}
+        run: npx bundlesize
+      - if: ${{ matrix.node != 14 }}
+        run: npx --yes bundlesize
   publish:
     if: ${{ github.ref == 'refs/heads/release' }}
     needs: [build, unit-test, smoke-test, lint]