docs: add SASS integration

[eye0fra]

add SASS integration for font-awesome

[clydin]

The existing instructions work with all of the style options. You can actually mix any of the supported style sheet formats with a single app.

[eye0fra]

Yes I know, they are instruction to how integrate font-awesome with sass in angular-cli, like they have done with bootstrap's wiki

[Brocco]

Looks good, please rebase.

[clydin]

Note that this works as well (with no additional changes required):

      "styles": [
        "../node_modules/font-awesome/scss/font-awesome.scss",
        "styles.scss"
      ],

[filipesilva]

@clydin it does, but showing this setup also helps in other cases where sass doesn't resolve paths. I think it's useful for that.

[clydin]

Understood and agree. My only concern is that the impression may be given that the described method is the required method.

[filipesilva]

As far as usage goes though, there's absolutely no difference between using the .css and .scss in the assets array afaik. So a user that wanted to do something specific with FA, or use it as part of a single sass global style, is better off this way, no?

[eye0fra]

Agree :)

[clydin]

My concern is that someone reading this and wanting to use SCSS in their app may very well think that these steps must be followed to use font-awesome and SCSS in general in their app.

Also with the upcoming improvements to url() handling the need for the path variable should hopefully be eliminated. But I suppose that can be eliminated later.

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