Allow Cachet to be setup not from the server's root

[nalysius]

The asset() helper was missing at some places so it was not possible
to install it in an other place than the server's root (/).

The paths have been fixed and now use the asset() helper. Also,
The steps process takes care of the current path.

See: #3618

[anthosz]

@anthonybocci, I confirm that css/js/images are now OK (dashboard, status page (connected or anonymous) and setup page) but the fonts path are not fixed: /fonts/ionicons.woff and /fonts/ionicons.ttf doesn't use custom path

Thank you!

[agentcobra]

link with #3645?

[nalysius]

@agentcobra yes it's related to #3645. Here I target 2.4 branch, the other PR targets 2.3.

[nalysius]

Hi @anthosz, I checked by loading the setup page, but I don't find any 404 error in my browser. Could you explain me a bit more?
Here is my browser's console when I load /setup:

[anthosz]

Hi @anthonybocci

Maybe the fonts are not used in setup page, do you have the 404 after setup? (status and dashboard page)

[nalysius]

@anthosz Ok I didn't understood. I'd tested only the setup part. I don't know where the font is included, probably somewhere from the CSS. I'll have a look, thanks for the explanation :)

[jbrooksuk]

Yeah, the fonts are loaded from CSS itself. I'd quite like to remove the icon font and use SVG at some point anyway.

I know @ojdon is working on implementing the redesign.

[nalysius]

So is the PR mergeable @jbrooksuk? I don't touch the CSS since the design is under work.

[jbrooksuk]

This seems to work locally, thanks @anthonybocci!