[BUG] unused dependency on glyphicons

[knz]

Mandatory Step

• I am using latest production release of Elegant

Description

Describe the bug
The generated CSS depends on the Glyphicons package which causes:

• every client to go search for img/glyphicons-halflings.png and img/glyphicons-halflings-white.png which incurs expensive network traffic
• the CSS to be bloated by 1-2KB (because it embeds bootstrap/sprites.less

All this while none of the generated pages actually use the glyphicons.

To Reproduce
Steps to reproduce the behavior:

1. build a site
2. grep for glyphicons in the CSS
3. look at the HTTP server logs - plenty of unsatisfied requests for the .png file
4. meanwhile grep for icon- in the generated HTML, observe none is used

Expected behavior

The references to Glyphicons should be removed from the generated CSS because they are unused.

[talha131]

This happens because Bootstrap needs them. But we do not use that part of the Boostrap. Still this needs to be fixed.

Next release is going to focus on removing Bootstrap completely, which will fix this issue.

[silverhook]

For reference, this is the issue that deals with removing Boostrap: #429