Add better font for the theme

[pourmand1376]

This is what al-folio uses.

• https://fonts.googleapis.com/css?family=Roboto:300,400,500,700%7CRoboto+Slab:100,300,400,500,700%7CMaterial+Icons

<link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700%7CRoboto+Slab:100,300,400,500,700%7CMaterial+Icons">

[rohandebsarkar]

I actually have a strong opinion on this. I believe we should leave it to the website viewers to choose their own fonts rather than downloading a specific font every time someone views the website.

But if you feel this feature maybe necessary for many users then we can think of a way to provide the users to choose their own fonts.

And I would also like to keep the resource calls as minimum as possible for a new visitor. If I am not wrong presently we make two resource calls (one for the html and one for the css), except on pages with math typesetting (then katex dependencies are required, I will look into it later if we can include katex dependencies within html during build time so we do not have to depend on CDNs).

[rohandebsarkar]

This is what al-folio uses.

* https://fonts.googleapis.com/css?family=Roboto:300,400,500,700%7CRoboto+Slab:100,300,400,500,700%7CMaterial+Icons

<link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700%7CRoboto+Slab:100,300,400,500,700%7CMaterial+Icons">

This was included as a part of material bootstrap. While writing code for alshedivat/al-folio#741, I felt it was quite unnecessary if users do not want to use material design. I included a config to disable material design which will not include the font in al-folio.

[pourmand1376]

I agree with your point. I think we should give the user the ability to change the font if he/she wants.

Today, I wanted to change the font to something else and I put in an hour and still I couldn't do it.

I do not have any problems here if it is simple enough for anyone to do it for themselves.