⬆️🎨 Update dependencies, improve code base with scss styles, switch t…

…o yarn for better dependency resolution.

Generate lockfiles

Update _app.js

The `Container` in `_app` has been deprecated and should be removed. https://err.sh/vercel/next.js/app-container-deprecated

Remove deprecated studioHintsConfig

:bug: Fix travis.yml to use yarn rather than npm.

:fire: Drop nodejs 8 compatibility.

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
-/build
-/node_modules
+build
+node_modules
+.vscode

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - '8'
   - '10'
   - '12'
 
@@ -9,7 +8,7 @@ cache:
     - '$HOME/.npm'
 
 install:
-  - npm ci
+  - yarn install
 
 script:
-  - npm test
+  - yarn test

README.md

@@ -14,13 +14,13 @@ Want to make a template for Sanity and your favourite front-end framework? We’
 
 You develop the templates in `/template`, and review your changes in `/build`.
 
-1. **Install dependencies with `npm install` in the root folder.** This will install the template development tool that watches changes in the `/template` folder and output the template to `/build`.
+1. **Install dependencies with `yarn install` in the root folder.** This will install the template development tool that watches changes in the `/template` folder and output the template to `/build`.
 
-2. **Run `npm run dev` in root folder.** This will build the template files to `/build`. This is how the code will look for those who install the project later.
+2. **Run `yarn dev` in root folder.** This will build the template files to `/build`. This is how the code will look for those who install the project later.
 
-3. **Run `npm install` in `./build/web` and `sanity install` in `/build/studio`** This will install the necessary dependencies for the Next.js frontend and the Studio.
+3. **Run `yarn install` in `./build/web` and `sanity install` in `/build/studio`** This will install the necessary dependencies for the Next.js frontend and the Studio.
 
-4. **Run `npm run dev` in `./build/web` and `sanity start` in `/build/studio`**. This will start the development servers for the Next.js frontend and Sanity Studio.
+4. **Run `yarn dev` in `./build/web` and `sanity start` in `/build/studio`**. This will start the development servers for the Next.js frontend and Sanity Studio.
 
 ## Notes