Automate documentation deployment

To the loot.github.io repo/site. This script has been tested locally,
aside from the final git push command.

scripts/appveyor/deploy_docs.ps1

@@ -0,0 +1,46 @@
+$docsRepoUrl = 'https://github.com/loot/loot.github.io.git'
+$docsRepoPath = 'C:\projects\loot.github.io'
+$docsIndex = 'docs/index.html'
+$sourceFolder = $env:APPVEYOR_BUILD_FOLDER + '/docs'
+$destinationFolder = 'docs/' + $env:APPVEYOR_REPO_TAG_NAME
+
+$searchOption = '<option value="([^"]+)" selected>([^<]+)</option>'
+$replaceOption = '<option value="$1">$2</option>'
+
+$searchSelect = '(<select id="versionSelect">)'
+$replaceSelect = '$1' + "`n" + '    <option value="' + $env:APPVEYOR_REPO_TAG_NAME + '" selected>v' + $env:APPVEYOR_REPO_TAG_NAME + '</option>'
+
+$docsFiles = @(
+  'images'
+  'licenses'
+  'LOOT Metadata Syntax.html'
+  'LOOT Readme.html'
+)
+
+$commitMessage = 'Add v' + $env:APPVEYOR_REPO_TAG_NAME + ' release docs'
+
+if ($env:APPVEYOR_REPO_TAG) {
+  cd 'C:\projects'
+  git clone $docsRepoUrl
+
+  # Edit the docs index to list and select by default the new release docs.  | %{$_ -replace $searchSelect, $replaceSelect}
+  cd $docsRepoPath
+  $newDocsIndex = cat -Raw $docsIndex | %{$_ -replace $searchOption, $replaceOption} | %{$_ -replace $searchSelect, $replaceSelect}
+  [IO.File]::WriteAllLines($docsRepoPath + '\' + $docsIndex, $newDocsIndex)
+
+  # Add the docs to their subfolder.
+  foreach($file in $docsFiles) {
+    cp $($sourceFolder + '/' + $file) $($destinationFolder + '/' + $file) -Force -recurse
+  }
+
+  # Configure Git credentials
+  git config credential.helper store
+  Add-Content "$env:USERPROFILE\.git-credentials" "https://$($env:access_token):x-oauth-basic@github.com`n"
+  git config user.email "oliver.hamlet+wrinklyrobot@gmail.com"
+  git config user.name "WrinklyRobot"
+
+  # Commit and push the changes.
+  git add $docsIndex $destinationFolder
+  git commit -m $commitMessage
+  git push
+}