HD icons, and minor UI polishing

[Jackymancs4]

Hello, trying to solve #101

Before	After

I used https://getbootstrap.com/docs/3.3/components/#glyphicons-glyphs inside a very lightweight custom build (made with https://getbootstrap.com/docs/3.3/customize/). I fixed the popup-actions subtitles that now stay in place and display the little green arrow-up I also forced icon48.png instead of icon.png.

The PR is still not finished. Things that are still missing:

1. the open-unsaved-all-news element (which I have not fully understood)
2. save-feed that seems to use a custom icon (save.png)
3. style.css require some cleaning from unused elements
4. if merged, glyphicons-halflings.png should be deleted

The whole PR has been tested on firefox 58 (Screeshot) and Chrome 64.

[olsh]

Hello @Jackymancs4,

Thank for the PR, great job 👍

the open-unsaved-all-news element (which I have not fully understood)

This just opens all saved news and unsaves them. You can see the button if you click on the Saved tab.

save-feed that seems to use a custom icon (save.png)

We would replace the icon with glyphicon glyphicon-bookmark

style.css require some cleaning from unused elements if merged, glyphicons-halflings.png should be deleted

I'll do that, if I have some time,

[Jackymancs4]

This just opens all saved news and unsaves them. You can see the button if you click on the Saved tab.

Cool, a feature I never knew existed! And here some new screenshots with the newest update:

Problems 1, 2, and 4 should be fixed 👍

[olsh]

@Jackymancs4 thank you. All your work with minor changes was merged to master in #117 👍