Improve user experience in Get Started guide for NGF

[shaun-nx]

Closes #788

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[shaun-nx]

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[ADubhlaoich]

LGTM! Please keep conventional commits in mind when merging this for the sake of a correctly formatted title.

[ADubhlaoich]

Still generally LGTM: edit suggestions to make the explanations of the command output sequential and more concise.

[ADubhlaoich]

Suggested change

	Run the below command to deploy the **coffee* application into your cluster.
	This command will also create a file called `cafe.yaml` in your current working directory:
	Run the following command to create the file _cafe.yaml_, which is then used to deploy the *coffee* application to your cluster:

Collapsing the two sentences into one line, and phrasing it in the sequence executed.

Right now it reads as though the YAML file incidentally manifests, instead of being a requirement for the apply command.

Making similar suggestions elsewhere in the file.

[ADubhlaoich]

Suggested change

	Run the below command to deploy a gateway your cluster.
	This command will also create a file called `gateway.yaml` in your current working directory:
	Run the following command to create the file _gateway.yaml_, which is then used to deploy a Gateway to your cluster:

[ADubhlaoich]

Suggested change

	Run the below command to deploy a two `HTTPRoute`resources into your cluster. One for `/coffee` and one for `/tea`.
	This command will also create a file called `cafe-routes.yaml` in your current working directory:
	Run the following command to create the file _cafe-routes.yaml_. It is then used to deploy two *HTTPRoute* resources in your cluster: one each for _/coffee_ and _/tea_.