Add PowerShell uninstall script

Tips-and-Tricks.md

@@ -186,3 +186,17 @@ for section in conf:
                 print("Removing ", realpath)
                 os.unlink(realpath)
 ```
+
+Here's an equivalent script for PowerShell ([source](https://github.com/anishathalye/dotfiles_template/pull/19#issuecomment-729518540), [powershell-yaml](https://github.com/cloudbase/powershell-yaml) required)
+
+```ps
+$CONFIG = "install.conf.yaml"
+
+$confObj = ConvertFrom-Yaml ([string](Get-Content $CONFIG -Raw))
+foreach ($target in ($confObj | Where-Object Keys -eq link).Values.Keys) {
+    if ((Get-Item $target -Force -ErrorAction SilentlyContinue).LinkType -eq "SymbolicLink") {
+        Write-Host "Removing $target" -ForegroundColor Red
+        Remove-Item $target
+    }
+}
+```