Refactor and standardize

[shencynthia]

Notion ticket link

Refactor and standardize

Implementation description

In hopes of making the frontend code base cleaner for future terms, I did some refactoring.

• Update routes to be kebab-case
• Move images and pages out of src/components

Steps to test

1. test out that existing pages did not break

What should reviewers focus on?

• do we agree with the refactors? will this make it easier to navigate the frontend code?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[trinity-y]

tested the routes 👍

[tonyqiu123]

export const DISPLAY_ENTITY_PAGE = "/entity";
export const DISPLAY_SIMPLE_ENTITY_PAGE = "/simpleEntity";

i tested each route and they all work except for the two above. i'm not familiar with these routes but if they don't need to be working, then this PR LGTM

[shencynthia]

export const DISPLAY_ENTITY_PAGE = "/entity"; export const DISPLAY_SIMPLE_ENTITY_PAGE = "/simpleEntity";

i tested each route and they all work except for the two above. i'm not familiar with these routes but if they don't need to be working, then this PR LGTM

@tonyqiu123 These are both from startercode, not used in our app!