math.js website

This project contains the website of math.js, available at https://mathjs.org. The website is static, and is hosted on github pages.

Update

To update the website with the latest version of math.js:

Update the version number of math.js in package.json.
Install the dependencies via npm:
```
npm install
```
Update the docs, examples, and version number via the build tool:
```
npm run build
```
Note that this script will update a git submodule ./mathjs-src which checks out the master branch and generates the docs and examples fresh from the source code.
Ensure any new pages are added to git.
To generate the website locally using Jekyll:
```
jekyll
```
This will generate the static website in the folder _site.
To test the website locally, use Jekyll as server:
```
jekyll --server 4000
```
The website is than available in the browser at http://localhost:4000.

To deploy the website, all that is needed is to commit the changes via git, and push the changes to the gh-pages branch of math.js on github.