feat: add instagram, hide twitter

[wesleyboar]

Overview / Changes

• Add Instagram SVG.
• Add Instagram in social media template.
• Hide Twitter in social media template.

Related

None.

Testing

1. Open CMS instance.
2. Create snippet with "TEMPLATE:" set to snippets/logos-social-media.html.
3. Save template on page.
4. Verify you see social media icons: Facebook, YouTube, LinkedIn, Instagram.

UI

Create Snippet	Render Snippet

Notes

Snippet renders giant icons, because there are no styles, because that is left to client unless CMD comes up with a standard pattern to display them. Currently, they are used only on https://www.tacc.utexas.edu/.