7.0.0

• Moved next to a peerDependency so we don't need to keep re-releasing to update the version of next.
• Switched to using a next plugin so that this will interop with a regular next.js app.
• Rewrite server bits to use fastify and compression.
• Temporarily disable ssr caching until a better solution is found.
• Test custom routes, exportPathMap, and now v2 custom routes