Finalize layout adaptation and ensure button consistency (#175)

Refine theme adjustments for subtlety

Increase overlay animation speed

Adapt general page layout for tablet/mobile; move common styles; revise page structure for universality

Update rates page layout; optimize for tablet/mobile

Move theme switcher to side menu; adjust link behavior

Upgrade Transactions and Payouts page layouts; add mobile adaptation

Consolidate layout styles into main.css to prevent duplication and FOUC; restrict theme files to color schemes and minor customizations; remove overlay; fix pagination bug

Adapt Manage Pages and Payout Pages for devices; standardize button styles

Refine currency selection

Author: pogorielova