style: user interface improvements
Various style and UI improvements, including color matching, centering, and code cleanup. Also introduced help button linking to user guide.
Closes issue #48 (closed) Closes issue #49 (closed)
Co-authored-by: Alex Wyner alex.wyner2@gmail.com Co-authored-by: Leyshmarie Jimenez Ramos <@Marie__>
Edited by awyner