Use @signalapp/better-sqlite3

CONTRIBUTING.md

@@ -26,7 +26,7 @@ you can just run `nvm use` in the project directory and it will switch to the pr
 desired Node.js version. [nvm for windows](https://github.com/coreybutler/nvm-windows) is
 still useful, but it doesn't support `.nvmrc` files.
 
-Then you need [`git`](https://git-scm.com/) and [`git-lfs`](https://github.com/git-lfs/git-lfs/wiki/Installation), if you don't have those yet.
+Then you need [`git`](https://git-scm.com/), if you don't have it installed yet.
 
 ### macOS
 
@@ -54,7 +54,6 @@ Install the [Xcode Command-Line Tools](http://osxdaily.com/2014/02/12/install-co
 Now, run these commands in your preferred terminal in a good directory for development:
 
 ```
-git lfs install                # Setup Git LFS.
 npm install --global yarn      # Make sure you have have `yarn`
 git clone https://github.com/signalapp/Signal-Desktop.git
 cd Signal-Desktop
@@ -78,12 +77,10 @@ the latest built assets when you change a file. Run each of these in their own t
 instance while you make changes - they'll run until you stop them:
 
 ```
-yarn transpile --watch         # recompiles when you change .ts files
-yarn sass-manifest --watch     # recompiles when you change .scss files
+yarn dev:transpile # recompiles when you change .ts files
+yarn dev:sass      # recompiles when you change .scss files
 ```
 
-If you miss the `git-lfs` step, run `yarn cache clean` and remove `node_modules` before trying again.
-
 ### webpack
 
 Some parts of the app (such as the Sticker Creator) have moved to webpack.