fix: update logo for product consistency

[IanKrieger]

Want to change the logo for more consistency

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https://github.com/brave/ads-ui/assets/48930920/8426a90d-dccb-410f-a726-6c821ceaead7

[lukaslevert]

Logo, headers, and hamburger menu look great @IanKrieger.

What about if we changed "Ad inquires" to "Contact sales" so that it's clear that it's not just general inquiries, but a way of contacting the sales team?

What I'd like to try to avoid is people contacting that email with support queries for self-service, since those should be going to the ad ops email, not the sales outreach.

[github-actions[bot]]

[puLL-Merge] - brave/ads-ui@1211

Description

This PR makes several changes to the landing page UI, including:

• Adding new Brave logo SVG images
• Updating the app bar with links to various pages like "Brave Search Ads", "Basic Attention Token", and "Contact sales"
• Extracting a reusable PageLink component for the app bar links
• Some style and layout tweaks

The motivation seems to be to improve the landing page navigation and branding.

Changes

### Changes **src/assets/images/full-brave-brand-black.svg** and **src/assets/images/full-brave-brand.svg** - Added new SVG versions of the Brave logo **src/components/AppBar/LandingPageAppBar.tsx** - Imported the new Brave logo SVGs and use them conditionally based on page - Added several new `PageLink` components to the app bar for pages like "Brave Search Ads", "Basic Attention Token" etc - Moved "Get started" link into a `PageLink` - Added the page links to the mobile menu - Some other minor refactoring and cleanup **src/components/AppBar/PageLink.tsx** - Added new reusable `PageLink` component that renders a link with translated text - Takes `to` prop for URL, `msg` prop for i18n message, and `textColor` - Handles mobile styling **src/locales/en.po**, **src/locales/es.po**, **src/locales/pt.po**, **src/locales/test.po** - Localization file updates **src/search/SearchLandingPage.tsx** - Minor padding tweak to image carousel on small screens

Security Hotspots

• The SVG logos are loaded from the same origin so there are no obvious vulnerabilities from those additions.
• The to prop of PageLink that sets the link URL comes from constants within the same component, so is not vulnerable to injection.

Let me know if you have any other questions!