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

docs/examples/democoin/mock/validator.go

@@ -0,0 +1,162 @@
+package mock
+
+import (
+	"bytes"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/tendermint/tendermint/crypto"
+)
+
+// Validator implements sdk.Validator
+type Validator struct {
+	Address sdk.ValAddress
+	Power   sdk.Dec
+}
+
+// Implements sdk.Validator
+func (v Validator) GetStatus() sdk.BondStatus {
+	return sdk.Bonded
+}
+
+// Implements sdk.Validator
+func (v Validator) GetOperator() sdk.ValAddress {
+	return v.Address
+}
+
+// Implements sdk.Validator
+func (v Validator) GetConsPubKey() crypto.PubKey {
+	return nil
+}
+
+// Implements sdk.Validator
+func (v Validator) GetConsAddr() sdk.ConsAddress {
+	return nil
+}
+
+// Implements sdk.Validator
+func (v Validator) GetTokens() sdk.Dec {
+	return sdk.ZeroDec()
+}
+
+// Implements sdk.Validator
+func (v Validator) GetPower() sdk.Dec {
+	return v.Power
+}
+
+// Implements sdk.Validator
+func (v Validator) GetDelegatorShares() sdk.Dec {
+	return sdk.ZeroDec()
+}
+
+// Implements sdk.Validator
+func (v Validator) GetCommission() sdk.Dec {
+	return sdk.ZeroDec()
+}
+
+// Implements sdk.Validator
+func (v Validator) GetJailed() bool {
+	return false
+}
+
+// Implements sdk.Validator
+func (v Validator) GetBondHeight() int64 {
+	return 0
+}
+
+// Implements sdk.Validator
+func (v Validator) GetMoniker() string {
+	return ""
+}
+
+// Implements sdk.Validator
+type ValidatorSet struct {
+	Validators []Validator
+}
+
+// IterateValidators implements sdk.ValidatorSet
+func (vs *ValidatorSet) IterateValidators(ctx sdk.Context, fn func(index int64, Validator sdk.Validator) bool) {
+	for i, val := range vs.Validators {
+		if fn(int64(i), val) {
+			break
+		}
+	}
+}
+
+// IterateBondedValidatorsByPower implements sdk.ValidatorSet
+func (vs *ValidatorSet) IterateBondedValidatorsByPower(ctx sdk.Context, fn func(index int64, Validator sdk.Validator) bool) {
+	vs.IterateValidators(ctx, fn)
+}
+
+// IterateLastValidators implements sdk.ValidatorSet
+func (vs *ValidatorSet) IterateLastValidators(ctx sdk.Context, fn func(index int64, Validator sdk.Validator) bool) {
+	vs.IterateValidators(ctx, fn)
+}
+
+// Validator implements sdk.ValidatorSet
+func (vs *ValidatorSet) Validator(ctx sdk.Context, addr sdk.ValAddress) sdk.Validator {
+	for _, val := range vs.Validators {
+		if bytes.Equal(val.Address.Bytes(), addr.Bytes()) {
+			return val
+		}
+	}
+	return nil
+}
+
+// ValidatorByPubKey implements sdk.ValidatorSet
+func (vs *ValidatorSet) ValidatorByConsPubKey(_ sdk.Context, _ crypto.PubKey) sdk.Validator {
+	panic("not implemented")
+}
+
+// ValidatorByPubKey implements sdk.ValidatorSet
+func (vs *ValidatorSet) ValidatorByConsAddr(_ sdk.Context, _ sdk.ConsAddress) sdk.Validator {
+	panic("not implemented")
+}
+
+// TotalPower implements sdk.ValidatorSet
+func (vs *ValidatorSet) TotalPower(ctx sdk.Context) sdk.Dec {
+	res := sdk.ZeroDec()
+	for _, val := range vs.Validators {
+		res = res.Add(val.Power)
+	}
+	return res
+}
+
+// Helper function for adding new validator
+func (vs *ValidatorSet) AddValidator(val Validator) {
+	vs.Validators = append(vs.Validators, val)
+}
+
+// Helper function for removing exsting validator
+func (vs *ValidatorSet) RemoveValidator(addr sdk.AccAddress) {
+	pos := -1
+	for i, val := range vs.Validators {
+		if bytes.Equal(val.Address, addr) {
+			pos = i
+			break
+		}
+	}
+	if pos == -1 {
+		return
+	}
+	vs.Validators = append(vs.Validators[:pos], vs.Validators[pos+1:]...)
+}
+
+// Implements sdk.ValidatorSet
+func (vs *ValidatorSet) Slash(_ sdk.Context, _ sdk.ConsAddress, _ int64, _ int64, _ sdk.Dec) {
+	panic("not implemented")
+}
+
+// Implements sdk.ValidatorSet
+func (vs *ValidatorSet) Jail(_ sdk.Context, _ sdk.ConsAddress) {
+	panic("not implemented")
+}
+
+// Implements sdk.ValidatorSet
+func (vs *ValidatorSet) Unjail(_ sdk.Context, _ sdk.ConsAddress) {
+	panic("not implemented")
+}
+
+// Implements sdk.ValidatorSet
+func (vs *ValidatorSet) Delegation(_ sdk.Context, _ sdk.AccAddress, _ sdk.ValAddress) sdk.Delegation {
+	panic("not implemented")
+}