Improve On-Page SEO Factors - H1, Meta Tags, Title, Imgs, URL Structure

[sunnymui]

There's some simple stuff that could improve the on page SEO of the main site.

• The main value proposition should be in an <h1> tag since it's effectively the most important piece of content on the page: "Where makers, designers, developers, and subject matter experts come together to use technology to solve civic problems." That also means "Code for San Jose" doesn't need to be there in the <h2> tag, so I'd just remove it completely since the site title is already in the top nav, making that redundant
• The meta description tags (both normal and open graph) should have an actual real description of the organization and work.
• <title> tag should have a short description coming after Code for San Jose, with a title ~ 50-60 characters for best display in SERPs (search engine results pages)
• There's one image that's 1.6 mb and unoptimized dropping the page speed
• <img> elements could be using srcset attributes for improved page speed
• URL structure could be a little more directly descriptive for the About and Projects pages (currently /docs/home and /docs/projects respectively, should be /about and /projects to match anchor text)