Add social sharing buttons

[leason]

Three new optional params added to the site config:

• twitterHandle = "your-twitter-handle"
• shareOnLinkedIn = true/false
• shareOnTwitter = true/false

If you supply twitterHandle a "follow me on twitter" button is added to the footer and displayed on all pages.

The shareOnLinkedIn and shareOnTwitter options allow you to show or hide the respective share icons that are displayed on post pages rendered through single.html.

I pulled in the latest style.css and re-created the main.min.css file. I believe it includes the latest changes.

[leason]

This will resolve #22

[leason]

Also, you can see this live on https://eason.blog

[leason]

@josephhutch is the minified CSS here okay with you or do you want me to run it through the same minifier you've been using and resubmit? Happy to do that if you'd prefer it that way.

[leason]

I saw your minify CSS command and just pushed an update to the main.min.css file. It includes the xcode and font css now. Give it a look and let me know what you think.

[leason]

@josephhutch did you need anything else from me on this?

[josephhutch]

@leason Thank you for the updates! I am going to work on introducing your changes in a way that better fits the visual style of the theme. Your blog is looking great by the way, let me know if there is anything else I can do to improve this theme.

[Barsonax]

On my fork I added some social media buttons to aether, maybe these fit the style a bit better:

https://www.the-photographing-programmer.com/
https://github.com/Barsonax/aether/tree/d86ca84bdf9418a19761c649bc420540b41a7729

Note: actual icons were taken from Jekyll Now which I used previously.