* use the background-color property instead of the background shorthand
* add multiple classes with one `addClass` call
* rename `underline` to `text-underline`
* use the CSS class `pointer` instead of adding CSS via JS
* change `border-color: transparent` to `border: 0` in the navbar right dropdown image
* add image dimensions in the dropdown donate image
* remove the obsolete and unneeded `center` element from network.php
* remove commented out PHP code from header.php
* fix wrong `form-control` class used in buttons
Signed-off-by: XhmikosR <xhmikosr@gmail.com>
