Add Meta Tags

[wzalazar]

We need to put the meta tags, this is necessary to share properly in the social networks.

For, example, we have in https://po.et

<meta content="Po.et is a shared, universal ledger designed to track ownership and attribution for the world's digital creative assets">
<meta content="Po.et" property="og:title">
<meta content="Po.et is a shared, universal ledger designed to track ownership and attribution for the world's digital creative assets" property="og:description">
<meta content="https://uploads-ssl.webflow.com/5a0c978e0d22aa0001464356/5a79d2b079d68e0001d124a0_poet-OG-img%20(2).jpg" property="og:image">
<meta content="summary" name="twitter:card">