Recommend --require in Node.js install (#621)
Recommend --require in Node.js install (#621)

* Recommend --require in Node.js install

Instead of importing the appsignal.js file into your app, we now
recommend passing it through the --require flag. This patch adds that
recommendation to the Node.js install docs, but also leaves the "old"
way.

* Update source/nodejs/installation/index.html.md

Co-authored-by: Tom de Bruijn <96835dd8bfa718bd6447ccc87af89ae1675daeca@tomdebruijn.com>

* Update source/nodejs/installation/index.html.md

Co-authored-by: Tom de Bruijn <96835dd8bfa718bd6447ccc87af89ae1675daeca@tomdebruijn.com>

* Update source/nodejs/installation/index.html.md

Co-authored-by: Tom de Bruijn <96835dd8bfa718bd6447ccc87af89ae1675daeca@tomdebruijn.com>

Co-authored-by: Tom de Bruijn <96835dd8bfa718bd6447ccc87af89ae1675daeca@tomdebruijn.com>
appsignal/appsignal-docs