Consolidate and standardize documentation.

doc/SetupShare.md

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+# Hosting the archive on Windows File Shares, MacOS Sharing, or Samba on Linux
+Set up a share to host the archive on a computer on your home network. These instructions assume that you created a share named "SailfishCam" on the server "Nautilus".
+
+It is recommended that you create a new user. Grant the user you'll be using read/write access to the share. These instructions will assume that the user you've created is named "sailfish" and that the password for this user is "pa$$w0rd".
+
+Now, on the Pi:
+1. Try to ping your archive server from the Pi. In this example the server is named `nautilus`.
+    ```
+    ping -c 3 nautilus
+    ```
+1. If the server can't be reached, ping its IP address (These instructions will assume that the IP address of the archive server is `192.168.0.41`.):
+    ```
+    ping 192.168.0.41
+    ```
+    To get the IP address of the archive machine:
+    * On Windows: Open a PowerShell session and type `ipconfig`. Get the IP address from the line labeled "IPv4 Address". 
+    * On MacOS or Linux open a terminal and type ifconfig.
+
+    If you can't ping the archive server by IP address from the Pi, go do whatever you need to on your network to fix that.
+    
+    If you can't reach the archive server by name but you can by IP address then use its IP address, below, for the `archiveserver` variable.
+
+1. Run these commands, subsituting your values:
+    ```
+    sudo -i
+    export archiveserver="Nautilus"
+    export sharename="SailfishCam"
+    export shareuser="sailfish"
+    export sharepassword="pa$$w0rd"
+    ```
+
+Now return to the section "Set up the USB storage functionality" in the [main instructions](/README.md).