fix(web): add missing option to tsconfig file (#1513)

There were a lot of `Cannot write file '<path>.js' because it would
overwrite input file.` TypeScript complaints apparently because the lack
of the [`outDir`](https://www.typescriptlang.org/tsconfig/#outDir)
option in the _tsconfig.json_ file to avoid the `.js` files overwrite.

This PR sets the `outDir` to the same directory than webpack build,
although another option would be to simply exclude `.js` having in mind
that the goal is to migrate all of them to `.ts`. Anyway, it's a
temporary problem already solved with the mentioned `outDir` option.

web/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "baseUrl": "./",
+    "outDir": "dist/",
     "isolatedModules": true,
     "target": "esnext",
     "moduleResolution": "node",