user: Implement Vendor Content and Styling

[anthonymalang]

Epic: #87

As a visitor to the STEM Festival web app, I want to view vendor information in a way that is easy to navigate and visually appealing so that I can quickly find vendors and activities of interest based on my preferences.

Definition of Done

• Vendor information is fully displayed
• Vendor layout is clean and readable
• Styling consistency is uniform with other pages
• Vendors page is responsive

Tasks

• Vendor Content Structure
• Vendor Content Population #95
• Implement Filtering Options
• Update Filters #132
• Create a filter button containing all filter options #153