update frontend docs paths
The following instructions are for setting up a standalone version of the Amundsen application. This approach is ideal for local development.
```bash
# Clone repo
-$ git clone https://github.com/lyft/amundsenfrontendlibrary.git
+$ git clone https://github.com/amundsen-io/amundsen.git
# Build static content
-$ cd amundsenfrontendlibrary/amundsen_application/static
+$ cd amundsen/frontend/amundsen_application/static
$ npm install
$ npm run build # or npm run dev-build for un-minified source
$ cd ../../
