SEO Improvements

[giliomeejg]

Here are a couple of thoughts to improve the SEO of some of our Explorer pages.

• Update the <title> with something specific for the round page, e.g. for https://grant-explorer.gitcoin.co/#/round/1/0x...938, the title could be 'UNICEF Round on Gitcoin'
• Update the <title> of a specific project page, e.g. for https://grant-explorer.gitcoin.co/#/round/1/0xdf...938 this could be 'Pixframe Studios - Transforming Education on gitcoin'
• Update the descriptions to use the first paragraph of the content on the page.
• Consider a URL structure that reduces the use of URL fragments

[vacekj]

@giliomeejg thank you for the suggestions - some of those are currently blocked on us using CRA on all apps. I have an RFC to move to Next on explorer in the works, so this will be fixed when that happens.