Logo is not aligned in main header

[yamcodes]

In the www main header, the following 3 things are not vertically aligned:

1. The ArkEnv logo icon
2. The ArkEnv logo text
3. The buttons' text in the header (Documentation)

We address this, and this might also affect the header in the docs. In fact, if we solve it in one place, it should be automatically solved in the other using a centralized solution/component.