Replace links from Metals to Scala Syntax

Some of the markup was copy-pasted from the metals-vscode extension.

Author: olafurpg

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 # Contributing
 
 This document explains the developer workflow for making changes to the
-[Metals extension](https://marketplace.visualstudio.com/items?itemName=scalameta.metals)
+[Scala Syntax (official) extension](https://marketplace.visualstudio.com/items?itemName=scala-lang.scala)
 for Visual Studio Code.
 
 ## Prerequisites

bin/ci-release.sh

@@ -27,7 +27,7 @@ if [[ -n "$DEPLOY_KEY" ]]; then
 fi
 git checkout -b travis-temp
 yarn version --no-git-tag-version --new-version $NEW_VERSION
-yarn github-changes -o scalameta -r metals-vscode --no-merges -t "VSCode Extension Changelog" -k $GITHUB_TOKEN
+yarn github-changes -o scala -r vscode-scala-syntax --no-merges -t "Scala Syntax (official) Changelog" -k $GITHUB_TOKEN
 git commit -am "Update release notes for $TRAVIS_TAG"
 git push origin HEAD:master