docs: Update FAQ to add missing yarn install command

Add yarn install to the FAQ docs

As someone who has never worked with either npm or yarn I was not aware that I need to run yarn install as well.
After having a chat in the Hydrogen room I was walked through to help me build hydrogen.

Either you initially meant to say yarn install instead of yarn init or it was assumed that one would run yarn install anyway.
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Moritz Dietz 2021-07-27 21:00:47 +02:00 committed by GitHub
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@ -28,7 +28,7 @@ You can only verify by comparing keys manually currently. In Element, go to your
## I want to host my own Hydrogen, how do I do that?
There are no published builds at this point. You need to checkout the version you want to build, or master if you want to run bleeding edge, and run `yarn init` and then `yarn build` in a console (and install nodejs > 14 and yarn if you haven't yet). Now you should find all the files needed to host Hydrogen in the `target/` folder, just copy them all over to your server. As always, don't host your client on the same [origin](https://web.dev/same-origin-policy/#what's-considered-same-origin) as your homeserver.
There are no published builds at this point. You need to checkout the version you want to build, or master if you want to run bleeding edge, and run `yarn init`, `yarn install` and then `yarn build` in a console (and install nodejs > 14 and yarn if you haven't yet). Now you should find all the files needed to host Hydrogen in the `target/` folder, just copy them all over to your server. As always, don't host your client on the same [origin](https://web.dev/same-origin-policy/#what's-considered-same-origin) as your homeserver.
## I want to embed Hydrogen in my website, how should I do that?