CSS refactor

[chaunmt]

CSS: the high-order transformation that needs to happen is that there needs to be a distinction between global and page-specific styling: GraphPage.css contains Search bar styling that is used everywhere but should only appear on the main page (very large padding, strict sizing, etc.).

CSS-related tasks:

• [x] destroy GraphPage.css (break up Search, Graph styling into dedicated files)
• [ ] Convert css to css module.
• [ ] Combine SearchBar.css, SearchBarSmall.css, SearchBarBig.css.
• [ ] Fix issue with search bar doesn't position at the correct place when come back from another page.
• [ ] Style Editor.css.