2.1.0

• [docs] Add React SPA demos to repo and site (#179) (179cb56), closes #179
• [docs] drop highlightjs reference and link up prism styles (b91872b)
• [docs] Fix quicklink logo (25829de)
• [docs] minor tweak to header text (cd31382)
• [docs] refactor api docs syntax highlighting (59f7eca)
• [docs] refactor copy-snippets syntax highlighting (5445a8b)
• [docs] refactor measure docs syntax highlighting (eaa87ac)
• [docs] refactor over-prefetching docs syntax highlighting (6ec1287)
• [docs] refactor react docs syntax highlighting (ba5984d)
• [docs] refactor usage docs syntax highlighting (25367f4)
• [docs] remainder of syntax highlighting fixes (cf32a85)
• [docs] remove highlightjs (7ff8c8f)
• [docs] Update CHANGELOG (c4a4726)
• [docs] various style theme improvements (06786fb)
• [feat] (options): Add a hrefFn option to build the URL to prefetch. (#201) (ee072d4), closes #201
• [feat] delay option to reduce impact on CDNs and servers [alternative without data-attributes] (#2 (5cdf569), closes #217
• [infra] add eleventy syntax highlighting (b48f80d)
• [infra] Add site to firebase hosting config (fe43486)
• [infra] bump version to 2.1.0 (81232e8)
• Added Ray-Ban and Oakley from Luxxotica to trustedByLogos section (#202) (b4494b0), closes #202
• Correct typo, duplicate "passing" (#185) (932f655), closes #185
• Fix issues typo in 'network-idle.js' (#218) (534e7b3), closes #218
• New demo page (#205) (5205d62), closes #205
• update homepage url in package.json (#184) (172275b), closes #184
• Updating broken link (224df77)
• Fix: Cannot read property 'then' of undefined (#188) (a8872b8), closes #188
• chore(deps): bump http-proxy from 1.18.0 to 1.18.1 (#200) (0aa5157), closes #200