Replaces Helmet with Head

[robdy]

Fixes #686

Pages to check

• [x] Root
• [x] Article
• [x] Tag page
• [x] /tags
• [x] /all ❌
• [x] /about

Tags to check

Canonical Title og:title og:URL description og:description plausible script ! Check for duplicate tags

Usage notes

• [x] You can only define the Head export inside a page (that includes templates for createPage), not in a component.
• [x] The contents of Gatsby Head get cleared upon unmounting the page, so make sure that each page defines what it needs in its . Po
• [x] The Head function needs to return valid JSX.
• [ ] Valid tags inside the Head function are: link, meta, style, title, base, script, and noscript.
• [x] html and body tags defined in Head overwrite the attributes defined in onRenderBody (setHtmlAttributes and setBodyAttributes).
• [x] Data block Githubissues.
• Githubissues is a development platform for aggregating issues.