Fixes the issues i could quickly find going top to bottom from the page.
These are also tested on mobile version, no major out-of-place artifacts were found
Changes:
center aligns the top logo and text.
makes the main download box look better.
adds a tasteful light lavenderish shadow to the main download box to match the overall theme of the page.
makes the donate button default call to action, makes it visible above-the-fold for better response.
moves the need-help section to near the footer of the page.
