Update tiles to use chart action icons in footer

[juliawu]

Switches our chart tiles to using icons in chart footers for the following functions: (1) downloading svg or csv, (2) link to visualization tool, (3) embed the chart as a web component, (4) provide feedback on the chart if on the explore page

Sample behavior:

Screen.Recording.2024-05-08.at.1.41.27.PM.mov

In particular, changes include:

• renaming chartEmbed to chart download to prevent confusion with embedding a web component
• New folder for the new modals
• A new chart embed modal that gives users the code for the web component version of the tile
• A new NL feedback modal
• Standardizing icons to using material icons instead of material symbols (reduces css to download)
• Web components now have a "Powered by Google's Data Commons" branding line

Visualization tools still use the old styling:

Web components use the new icons: