Grunt needs to convert SCSS -> CSS

[DJPaul]

Grunt has a SCSS linter, but doesn't convert the file to CSS.

I thought it did, so this was an oversight on my part when we started comitting #6291.

[djpaul]

In 9768:

Grunt: add tooling to convert SCSS to CSS files.

Fixes #6380

[DJPaul]

@netweb I think you said you were working on something like this, but hnla and I needed something quickly, so happy to hear any considered suggestions you might have.

[netweb]

Yeah, I did, yours is basically the same, for context it was in Slack ​here:

The compile .scss to .css task is "nearly done" -> ​https://cloudup.com/cwB9SXoNrMy

That said, it looks fine what you added, I'd suggest not naming the subtask admin, in bbPress this is named like so as we use SASS for our admin/MP6 themes, I think styles would be a better name for BuddyPress' current usage, and with the possibly that @tw2113 "wants" a BP MP6 theme it also leaves that door open.

[netweb]

Minor change to Grunt SCSS sub task name

[netweb]

The change in ​6380.1.diff from admin to styles is required as part of the proposed Grunt watch task in #6382 :)

[djpaul]

In 10230:

Build: rename Grunt sass admin task to sass styles

We SASS everything in the bp-legacy folder, so “styles” is a better
name for it. Also brings in line with sister project bbPress.

Fixes #6380

Props netweb