docs(fix): Removed references to macOS since it is no longer supported (#232)

Author: ashleykleynhans

content/en/docs/community/contributing/code/developer-guides/dev-env/getting-set-up.md

@@ -35,7 +35,7 @@ do multiple things, such as installing CLI tools or configuring service accounts
 way to approach this process is to open a step in its own browser tab and then work through
 it to completion, closing it (and any others you've opened in support of it) once it's done.
 
-1. [Install Halyard]({{< relref "/docs/setup/install/halyard#install-on-debianubuntu-and-macos" >}})
+1. [Install Halyard]({{< relref "/docs/setup/install/halyard#install-on-debianubuntu" >}})
 2. [Set up a storage service]({{< relref "/docs/setup/install/storage/" >}})
 3. [Set up your cloud provider of choice]({{< relref "/docs/setup/install/providers/" >}})
 4. [Configure a LocalGit deployment]({{< relref "/docs/setup/install/environment#local-git" >}})

content/en/docs/setup/install/_index.md

@@ -15,7 +15,7 @@ in [Quickstart](/docs/setup/quickstart/) might be a better choice.
 * A machine on which to install Halyard
 
   This can be a local machine or VM (Ubuntu 18.04 or higher,
-  Debian 10 or higher, or macOS), or it can be a Docker container.
+  Debian 10 or higher), or it can be a Docker container.
   Make sure it has at least 12GB of memory.
 
 * A Kubernetes cluster on which to install Spinnaker itself

content/en/docs/setup/install/halyard.md

@@ -20,7 +20,7 @@ just going to tell you to use Halyard.
 
 There are two ways you can install Halyard:
 
-* [locally on Debian/Ubuntu or macOS](#install-on-debianubuntu-and-macos)
+* [locally on Debian/Ubuntu](#install-on-debianubuntu)
 
    This can be on a desktop or laptop computer, or on a VM.
 
@@ -31,26 +31,19 @@ We recommend you install Halyard on a machine with at least 12GB of RAM.
 > **Note**: If you need to run Halyard without access to public internet, read
 > [Deploy Custom Spinnaker Builds](/docs/guides/operator/custom-boms/).
 
-## Install on Debian/Ubuntu and macOS
+## Install on Debian/Ubuntu
 
 Halyard runs on...
 
 * Ubuntu 18.04 or higher
 * Debian 10 or higher
-* macOS (tested on 10.13 High Sierra only)
 
 1. Get the latest version of Halyard:
 
-   For Debian/Ubuntu:
    ```bash
    curl -O https://raw.githubusercontent.com/spinnaker/halyard/master/install/debian/InstallHalyard.sh
    ```
 
-   For macOS:
-   ```bash
-   curl -O https://raw.githubusercontent.com/spinnaker/halyard/master/install/macos/InstallHalyard.sh
-   ```
-
 1. Install it:
 
    `sudo bash InstallHalyard.sh`
@@ -69,13 +62,14 @@ under `/var/log/spinnaker/halyard/halyard.log`.
 To get help with any `hal` command, append `-h`. Also, see the [Halyard command
 Reference](/docs/reference/halyard/commands).
 
-### Update Halyard on Debian/Ubuntu or macOS
+### Update Halyard on Debian/Ubuntu
 
 ```bash
-sudo update-halyard
+sudo apt-get update
+sudo apt --only-upgrade install spinnaker-halyard
 ```
 
-### Uninstall Halyard from Debian/Ubuntu or macOS
+### Uninstall Halyard from Debian/Ubuntu
 
 > __Important__: uninstalling Halyard deletes the entire contents of your `~/.hal`
 directory. Don't do it unless you're prepared to lose your configuration.

content/en/docs/setup/install/providers/docker-registry.md

@@ -19,7 +19,7 @@ repositories](https://docs.docker.com/glossary/?term=repository).
 Perform the steps in this article in the same place where you have Halyard
 installed, whether [in a Docker
 container](/docs/setup/install/halyard/#install-halyard-on-docker) or [locally on
-Ubuntu/Debian or macOS](/docs/setup/install/halyard/#update-halyard-on-debianubuntu-or-macos).
+Ubuntu/Debian](/docs/setup/install/halyard/#update-halyard-on-debianubuntu).
 
 ## Prerequisites