move index to src

src/index.txt

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+## introduction
+introduction ~
+getting-started ~
+
+## basics
+hello-world
+values
+variables
+inline-assignment
+constants
+for
+if-else
+switch
+arrays
+range
+slices
+maps
+functions
+multiple-return-values
+varadic-functions
+closures
+recursion
+defer
+panic
+pointers
+new
+structs
+methods
+embedding
+interfaces
+errors
+ok-guards
+
+## concurrency
+goroutines
+concurrent-goroutines
+channels
+channel-buffering
+channel-directions
+synchronization
+select
+timeouts
+scatter-gather
+rate-limiting
+worker-pools
+nonblocking-channel-operations
+closing-channels
+timers
+tickers
+state-goroutine
+state-mutex
+
+## core libraries
+sorting
+sorting-by-functions
+collection-functions
+string-functions
+string-formatting
+regexs
+bytes
+json
+typed-json ~
+time
+time-formatting ~
+epochs
+elapsed-time
+random-numbers
+number-parsing
+urls
+sha1-hashes
+base64-encoding
+
+## systems libraries
+reading-files
+writing-files
+standard-streams ~
+line-filters
+command-line-arguments
+command-line-flags
+environment-variables
+spawning-processes
+execing-processes
+signals
+exit
+
+## client libraries
+http-client
+https-client
+streaming-in-http-responses ~
+redis
+postgres
+mongodb ~
+sending-email
+
+## web apps
+hello-web
+requests ~
+responses
+request-routing
+request-logging
+static-content
+basic-authentication
+canonical-hosts
+post-bodies ~
+middleware
+streaming-out-http-responses ~
+graceful-shutdown
+https-servers
+
+## shipping go
+using-gofmt ~
+using-godoc ~
+publishing-packages ~
+deploying-to-heroku ~
+deploying-to-appengine ~