Visual and alignment updates

[JulianDietzel]

Since #252 and #262 might still take a while until they see the light of day, I finalized a few small fixes to the UI I had experimented with a while back. The update mainly concerns properly aligning elements and adding spacing to elements.

I'll list all changes below the screenshots. Let me know if you disagree with any of the changes or if I am good to merge.

Screenshots (old on top, new below)

Changes

• Added uniform spacing to left and right of all pages (technically this should be done with Bootstrap "containers" but that's an issue for another day)
• Aligned Trick- and ComboList items
• Added spacing to Trick- and ComboLists
• Created separate React-Component for Trick- / Combo-Items (the clickable rectangles in the lists) and made the borders thinner
• Made "About" modal larger on desktop. Mobile version remains the same.
• Added more padding to "Stick frequency" selector (both on Desktop and Mobile)
• Fixed alligment issues of ComboGenerator page
• Reordered two options of the advanced menu of the ComboGenerator

[JulianDietzel]

If no one disagrees by then, I will merge this some time next week