* Changed the version of node from 8 to 10

* fix lint errors

* Upgrade with-firebase-hosting-and-typescript example

* Update package.json

* Format missed files

* Remove unnecessary rule

* Fix type error

* Run prettier over packages/**/*.js

* Run prettier over packages/**/*.ts

* Run prettier over examples

* Remove tslint

* Run prettier over examples

* Run prettier over all markdown files

* Run prettier over json files

### changes
#### remove trailing spaces

When I was using example I noticed trailing spaces.
So, this PR removes the trailing spaces of json file, README, and others.

`examples/with-jest-typescript/src/modules/cars/Overview.tsx` also has it, but this time it did not change as tslint error occurs at commit.

I wrote a [script](https://github.com/j0lv3r4/dependency-version-updater) to update dependencies recursively in `package.json` files, e.g.:

```
$ node index.js --path="./examples" --dependencies="react=^16.7.0,react-dom=^16.7.0"
```

This PR contains the result against the examples folder.

There were several issues with the example [examples/with-firebase-hosting-and-typescript](https://github.com/zeit/next.js/tree/canary/examples/with-firebase-hosting-and-typescript)
* `npm run serve`
  * Has no `pre` task that actually builds the app. Requires manual running of all build scripts.
  * Will choke on windows because trying to set environment variables with `NODE_ENV=production`
* Outdated Typescript and Tslint
* Not being able to deploy because `firebase-tools` being of a deprecated version.
* Structure, which I understand is based on `firebase-tools` generation, is confising with `src/functions/src` being generally bad structuring.

I remedied this and also improved some other factors:

* Remove dependency `prettier` as it is unused (f4d6f54)
* Upgrade all dependencies (09a9193)
  * Use upgraded firebase dependencies to deploy to node 8 environment (87e1e09, 7d8055b)
  * Remove deprecated tslint rule `no-unused-variable` (9392162)
* Flattened filestructure in `src/functions` (097a25a)
* Use ES import when importing next (6c99adb)
* Fixed incorrect name and added somewhat to the description in package.json.
  `with-firebase-hosting` → `with-firebase-hosting-and-typescript` (1ffa0b5)
* Fixed `serve` script by building before running, using [`cross-env`](https://www.npmjs.com/package/cross-env) to set environment variables and remove unecessary flag. (3a1e221, 422ccee, 8811e44)
* Add `.firebase` cache to `.gitignore` (4d7cbe4)
* Add `-C` (clean) flag when copying dependency files `copy-deps` (0826708)
* Use `strict: true` in the functions tsconfig (229b04f)

This was tested by running serve on windows and linx(WSL) and deploy on linux(WSL)

---

This is based on #5819 but correctly based from `canary`

Preferably this installation wouldn't be necessary, but in lieu of a fix...

#4751

Update @zeit/next-typescript version on examples using it

* Update typescript examples to use 1.0.1 of next-typescript

* Add .babelrc modifications to upgraded typescript examples

Adds an example based off of @jthegedus work on firebase hosting, compatible with next v6 and using typescript in both the firebase functions and the next app.