Add redirects for 404s

[Alex Lakatos]

These pages have 404ed in July, in descending order. I've identified the alternate pages for some, the bottom batch can be ignored if you can't identify their corresponding page in the new website.

With redirects:

/overview.html /developer-tools/get-started/overview/
/setup-wallets.html /developer-tools/get-started/set-up/
/setup-wallets-programmatically.html /developer-tools/get-started/manage-accounts/
/news/news/recent-coverage/ /news/recent-coverage/
/rfcs/ /rfcs/0027-interledger-protocol-4/
/calls.html /developer-tools/community/#bi-weekly-calls
/community/ /developer-tools/community/
/rfcs/0027-interledger-/ /rfcs/0027-interledger-protocol-4/
/five-bells-condition/spec.html /rfcs/0027-interledger-protocol-4/
/libraries.html /developer-tools/tools/#libraries
/news/news/latest-updates/ /news/latest-updates/
/spin-up-local-network.html /developer-tools/get-started/spin-up/
/connect-ilp-testnet.html /developer-tools/tools/#testnet-wallets
/getting-started.html /developer-tools/get-started/overview/
/news.html /news/
/overview/ /developer-tools/get-started/overview/
/videos.html /developer-tools/resources/

Couldn't find redirects for:

/rfcs/0039-stream-receipts/
/case-studies/reimaging-how-we-pay-for-content-and-apps/&ct=ga&cd=CAEYAioTOTczODcwNzE2Mjg2MDc2Nzk1NDIaNWE5M2JiYjc4OWNiNWJmMTpjb206ZW46VVM&usg=AFQjCNFTs_sQIqFU--HXG5Q4eSPuiMAlMg/
/rfcs/0025-pre-shared-key-2/0001-interledger-architecture/0001-interledger-architecture.md
/rfcs/0025-pre-shared-key-2/0016-pre-shared-key/0016-pre-shared-key.md
/rfcs/0032-peering-clearing-settlement/null/
/signin/
/api/elements.json
/api/pages.json
/api/posts.json
/case-studies/reimaging-how-we-pay-for-content-and-apps.hns.to.hns.to.hns.to.hns.to/
/cp/
/five-bells-wallet/apidoc/
/interledger.pd,2015
/login/
/news/introducing-the-interledger-foundation/null/
/ns/
/rfcs/0003-interledger-protocol/draft-9.html
/rfcs/0009-simple-payment-setup-protocol/draft-6.html
/rfcs/0015-ilp-addresses/0015-ilp-addresses.md
/rfcs/0028-web-monetization/draft-4.html
/search/?q=xdc category:5
/tutorials/letter-shop/
/uploads/briana-1.png
/uploads/briana.png
/zh/