NOJIRA: Add npm run serve, eslint, and flow targets

Add a devDependency on 'serve' to facilitate local testing of non-dev
builds (npm run build).

Author: sbates-idrc

.github/workflows/ci.yaml

@@ -32,11 +32,11 @@ jobs:
       - name: NPM install (ci)
         run: npm ci
       - name: Lint
-        run: npx eslint .
+        run: npm run eslint
       - name: Build
         run: npm run build
       - name: Flow
-        run: npx flow check
+        run: npm run flow check
       - name: Test
         run: npm test -- --verbose --coverage
       - name: Archive Test Code Coverage Report