Documentation Structure Change and Cleanup (#2808)

* Update docs/sdk/clients.md
* organize ADR directory like tendermint
* docs: move spec-proposals into spec/
* remove lotion, moved to website repo
* move getting-started to cosmos-hub, and voyager to website
* docs: move lite/ into clients/lite/
* move introduction/ content to website repo
* move resources/ content to website repo
* mv sdk/clients.md to clients/clients.md
* mv validators to cosmos-hub/validators
* move deprecated sdk/ content to _attic
* sdk/modules.md is duplicate with modules/README.md
* consolidate remianing sdk/ files into a single sdk.md
* move examples/ to docs/examples/
* mv docs/cosmos-hub to docs/gaia
* Add keys/accounts section to localnet docs

cmd/cosmos-sdk-cli/cmd/init.go

@@ -14,7 +14,7 @@ import (
 	tmversion "github.com/tendermint/tendermint/version"
 )
 
-var remoteBasecoinPath = "github.com/cosmos/cosmos-sdk/examples/basecoin"
+var remoteBasecoinPath = "github.com/cosmos/cosmos-sdk/docs/examples/basecoin"
 
 // Replacer to replace all instances of basecoin/basecli/BasecoinApp to project specific names
 // Gets initialized when initCmd is executing after getting the project name from user