Convert website to nextra (graphql#4240)

This converts the existing website to nextra just like
https://github.com/graphql/graphql.github.io. This is a first step in
moving the documentation here and having a redirect from graphql.org to
graphql-js.org.

Not sure yet why codecov started failing 😅 when I run `testonly:cover`
locally it tells me we are 100% covered.

WDYT about isolating the dependencies for the website in that folder? As
seen in
graphql@9c7d615
this prevents the weird CI leaks that we're seeing

Resolves graphql#4200

---------

Co-authored-by: Yaacov Rydzinski <[email protected]>

.gitignore

@@ -8,9 +8,10 @@
 /diff-npm-package.html
 /.eslintcache
 /.cspellcache
-/node_modules
+node_modules
 /reports
 /npmDist
 /npmEsmDist
 /denoDist
-/websiteDist
+/website/.next
+/website/out

.prettierignore

@@ -6,4 +6,6 @@
 /npmDist
 /npmEsmDist
 /denoDist
-/websiteDist
+/website/.next
+/website/out
+.next

cspell.yml

@@ -7,19 +7,14 @@ ignorePaths:
   - package.json
   - benchmark/github-schema.graphql
   - benchmark/github-schema.json
+  - website/icons
+  - website/css
 overrides:
-  - filename: '**/docs-old/APIReference-*.md'
-    ignoreRegExpList: ['/href="[^"]*"/']
-    words:
-      - sublinks
-      - instanceof
   - filename: 'website/**'
     dictionaries:
       - fullstack
       - html
     words:
-      - clsx
-      - infima
       - noopener
       - Vite
       - craco
@@ -54,6 +49,110 @@ words:
   - deno
   - hashbang
 
+  # Website tech
+  - Nextra
+  - headlessui
+  - Fastify
+  - svgr
+  - ruru
+
+  # used as href anchors
+  - graphqlerror
+  - syntaxerror
+  - formaterror
+  - graphqlschema
+  - graphqlscalartype
+  - graphqlobjecttype
+  - graphqlinterfacetype
+  - graphqluniontype
+  - graphqlenumtype
+  - graphqlinputobjecttype
+  - graphqllist
+  - graphqlnonnull
+  - graphqlint
+  - graphqlfloat
+  - graphqlstring
+  - graphqlboolean
+  - graphqlid
+  - getlocation
+  - isinputtype
+  - isoutputtype
+  - isleaftype
+  - iscompositetype
+  - isabstracttype
+  - getnullabletype
+  - getnamedtype
+  - introspectionquery
+  - buildclientschema
+  - buildschema
+  - printschema
+  - printintrospectionschema
+  - buildastschema
+  - typefromast
+  - astfromvalue
+  - typeinfo
+  - isvalidjsvalue
+  - isvalidliteralvalue
+  - specifiedrules
+  - Wordmark
+  - codeofconduct
+  - graphqlconf
+
+  # website words
+  - runtimes
+
+  # Website tech
+  - Nextra
+  - headlessui
+  - Fastify
+  - svgr
+  - ruru
+
+  # used as href anchors
+  - graphqlerror
+  - syntaxerror
+  - formaterror
+  - graphqlschema
+  - graphqlscalartype
+  - graphqlobjecttype
+  - graphqlinterfacetype
+  - graphqluniontype
+  - graphqlenumtype
+  - graphqlinputobjecttype
+  - graphqllist
+  - graphqlnonnull
+  - graphqlint
+  - graphqlfloat
+  - graphqlstring
+  - graphqlboolean
+  - graphqlid
+  - getlocation
+  - isinputtype
+  - isoutputtype
+  - isleaftype
+  - iscompositetype
+  - isabstracttype
+  - getnullabletype
+  - getnamedtype
+  - introspectionquery
+  - buildclientschema
+  - buildschema
+  - printschema
+  - printintrospectionschema
+  - buildastschema
+  - typefromast
+  - astfromvalue
+  - typeinfo
+  - isvalidjsvalue
+  - isvalidliteralvalue
+  - specifiedrules
+  - Wordmark
+  - codeofconduct
+  - graphqlconf
+
+  # website words
+  - runtimes
+
   # TODO: remove bellow words
   - QLID # GraphQLID
   - QLJS # GraphQLJS