chore: move all Footer icons to their own file

[dslovinsky]

Description

Tests using imports in custom MDX components

Related Issues

Changes Made

Testing

• I have tested these changes locally
• I have run the validation scripts (pnpm run validate)
• I have checked that the documentation builds correctly

[github-actions]

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[Copilot]

Pull Request Overview

Purpose: Extract inline footer SVG icons and the BuiltByFern component into separate, reusable components under a dedicated icons folder for better organization.

Key changes:

• Moved all inline SVG icon definitions from Footer.tsx into individual component files under components/icons.
• Extracted BuiltByFern into its own BuiltWithFern.tsx file and updated Footer.tsx to import all externalized assets.
• Simplified Footer.tsx header by replacing large inline SVG blocks with imports.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
fern/components/Footer.tsx	Replaced large inline icon and BuiltByFern definitions with imports to newly created components.
fern/components/BuiltWithFern.tsx	New component file for BuiltByFern; exports both named and default.
fern/components/icons/AlchemyLogo.tsx	New standalone AlchemyLogo SVG component.
fern/components/icons/AlchemyUniversityIcon.tsx	New standalone AlchemyUniversityIcon SVG component.
fern/components/icons/DiscordIcon.tsx	New standalone DiscordIcon SVG component.
fern/components/icons/EmailIcon.tsx	New standalone EmailIcon SVG component.
fern/components/icons/NewsletterIcon.tsx	New standalone NewsletterIcon SVG component.
fern/components/icons/RobotIcon.tsx	New standalone RobotIcon SVG component.
fern/components/icons/StatusIcon.tsx	New standalone StatusIcon SVG component.
fern/components/icons/SupportHubIcon.tsx	New standalone SupportHubIcon SVG component.
fern/components/icons/XIcon.tsx	New standalone XIcon SVG component.

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