chore(playgrounds): https is safe + delete dups (#6247)
- Change to `https` in those accepts SSL secure protocol
- Remove `cssdeck.com` dup
- Remove `ScalaFiddle.net`. Casino parked website. Right site already listed: `ScalaFiddle.io`
- Direct links on `codepad.org` to each language
Co-authored-by: NEric Hellman <eric@hellman.net>
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