Address designer QA items

[nahbee10]

Description

• Update type system and color based on the updated design system
• Mobile Menu Shows no information when accessed from the Submit a request page
• Submit A Request Form: Placeholder text not disappearing when user clicks in
• Overflow navigation should open to show the active topic
• Help button is overlapping with mobile menu
• Topics Section should switch to two up grid on mobile
• Left Nav
• Related Articles Block
• Submit Request Form
• Mobile Footer Layout Tweaks
• update the search dropdown style
• remove square bg color behind the search bar

Type(s) of changes

• Bug fix
• New feature
• Update to an existing feature

Motivation for PR

How Has This Been Tested?

Tested on local preview
⚠️ how to view the preview:
step 1. login to Uniswap Zendesk using credentials on 1password
step 2. open this link(https://support.uniswap.org/theming/theme/03977d98-78e7-4326-a99a-2f86e214b021) to activate the staging theme(will not affect the production theme)
step 3. open this link(https://support.uniswap.org/hc/en-us) to view the staging site without iframe nest

Applicable screenshots

Follow-up PR

[mokaymokay]

Still not seeing mobile menu on submit request page:

I tried setting the theme to dark then refreshing but it doesn't seem to persist?

[mokaymokay]

The theme setting doesn't persist for me.. Does it work for you?

Are breadcrumbs supposed to not wrap, or is this a bug?

Is there supposed to be an active state for when article upvote button state is aria-pressed=true? Right now there isn't one