[MF] styling list and items pages

[krsnamara]

Description

This code changes a lot of things within the code. I will list them here to help guide you through this PR:

• In all directories with barrel files add all of the exports to these files.
• Goes through and uses the barrel files to consolidates imports
• Creates onClick handleSignIn function that navigates user to /list after sign in
• Builds out a custom CSS checkbox with a purple check mark that bounces in upon clicking
• Adds class names and styling to corresponding style sheets to apply global colors
• Moves delete list button outside of navigation link to /manage-list, leaving user on list page post delete
• Conditionally renders the categories in SortedItemsMap. If user doesn't have an item the category will not crowd UI
• Creates default input styling in index.css to globally style text inputs with these class names
• Adds temporary profile image on landing page post login. (this will be removed in merge conflict resolution)
• Removes unused css from Link.css leftover from refactoring
  -Adds purple check mark favicon (this can be reverted or changed)

Related Issue

subissue #14
closes #89
closes #84

Acceptance Criteria

• Ensure the list page and Manage list page adhere to app colors and global styling.
• Refine search and create inputs by eliminating default styling and paint with app colors.
• Update redirects post sign-in and delete list to navigate users to the lists page instead of the landing page or keep users on the lists page after deleting a list
• standardize import structure across files for React, app functions/props, and CSS, ensuring index.js declarations are used for exports.

Type of Changes

Use one or more labels to help your team understand the nature of the change(s) you’re proposing. E.g., bug fix or enhancement are common ones.

Updates

Before

Landing Page

Lists Page

Manage-List Page

Favicon

After

Landing Page

Lists Page

Manage-List Page

Favicon

Testing Steps / QA Criteria

Login to app and start navigating around to see changes. Look over the AC and Summary to see all of the little details in the app.

[github-actions]

Visit the preview URL for this PR (updated for commit 73e85ce):

https://tcl-69-smart-shopping-list--pr90-mf-styling-list-and-jz5woo31.web.app

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[louieknolle]

Looks great and I'll approve before the peer reviews in case y'all need this merged in.

[piecanoe]

This looks so good, Marty! Thanks for putting in so much work!