feat: use optional chaining and nullish coalescing operator 🎉

[mcansh]

awaiting an update to @typescript-eslint/typescript-estree to fix prettier

[vercel]

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🔍 Inspect: https://zeit.co/mcansh/serverless-reddit-nextjs/h29ffi4by
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[mcansh]

📝Changed routes:

/api/manifest	/api/r/[subreddit]/[sort]
(view full size)	(view full size)

/api/r/[subreddit]	/api/r
(view full size)	(view full size)

/
(view full size)

Commit 1f605a2 (https://serverless-reddit-nextjs-git-feat-optional-chaining.mcansh1.now.sh).