chore: remove slack from script (#19)

Author: joelkesler

README.md

@@ -421,15 +421,6 @@ gcloud components install docker-credential-gcr --quiet
 
 ### Applications
 
-<details>
-  <summary>Slack</summary>
-  
-```sh
-brew install --cask slack
-```
-</details>
-
-
 <details>
   <summary>Firefox</summary>
 

setup-new-computer.sh

@@ -388,13 +388,6 @@ printDivider
 # Install  Apps
 printHeading "Installing Applications"
 
-    if [[ -d "/Applications/Slack.app" ]]; then
-        printDivider
-        echo "✔ Slack already installed. Skipping"
-    else
-        printStep "Slack"                     "brew install --cask slack"
-    fi
-
     if [[ -d "/Applications/Firefox.app" ]]; then
         printDivider
         echo "✔ Firefox already installed. Skipping"