feat: create button component

[aquivere]

button and its variants working :D

(dark mode looks scuffed on ghost and text buttons in the gif but it's just because the background's transparent)

[linear]

UIX-56 Code up buttons

Finally a coding ticket xD. Essentially, code up the button component into the ui-components repo here https://github.com/csesoc/ui-components. Some styles should have been provided in main somewhere but all you have to do is build upon that to include buttons (and all it's variants).

If possible, could you abstract some things like types and styles that currently exists in the code to it's own folder/file (ie. types/button.ts)

[Darianlmj]

From the screen recording, the icon in the 'button with icon' looks like it's the wrong colour. Also, make sure to add this to the CHANGELOG

[Darianlmj]

Lgtm! Resolve the comment then merge :)

[floyrin]

very epic buttons !!!!!