chore: remove proto docs (#10820)

## Description

Remove proto docs in favour of https://buf.build/cosmos/cosmos-sdk

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

.markdownlintignore

@@ -1,3 +1,2 @@
 CHANGELOG.md
-docs/core/proto-docs.md
 docs/node_modules

docs/core/grpc_rest.md

@@ -51,7 +51,7 @@ The `grpc.Server` is a concrete gRPC server, which spawns and serves all gRPC qu
 
 Once the gRPC server is started, you can send requests to it using a gRPC client. Some examples are given in our [Interact with the Node](../run-node/interact-node.md#using-grpc) tutorial.
 
-An overview of all available gRPC endpoints shipped with the Cosmos SDK is [Protobuf documention](./proto-docs.md).
+An overview of all available gRPC endpoints shipped with the Cosmos SDK is [Protobuf documention](https://buf.build/cosmos/cosmos-sdk).
 
 ## REST Server
 

scripts/protocgen.sh

@@ -25,15 +25,6 @@ Mgoogle/protobuf/any.proto=github.com/cosmos/cosmos-sdk/codec/types:. \
 
 done
 
-# command to generate docs using protoc-gen-doc
-buf protoc \
-  -I "proto" \
-  -I "third_party/proto" \
-  --doc_out=./docs/core \
-  --doc_opt=./docs/protodoc-markdown.tmpl,proto-docs.md \
-  $(find "$(pwd)/proto" -maxdepth 5 -name '*.proto')
-go mod tidy
-
 # generate codec/testdata proto code
 buf protoc -I "proto" -I "third_party/proto" -I "testutil/testdata" --gocosmos_out=plugins=grpc,\
 Mgoogle/protobuf/any.proto=github.com/cosmos/cosmos-sdk/codec/types:. ./testutil/testdata/*.proto

x/authz/spec/04_events.md

@@ -4,4 +4,4 @@ order: 4
 
 # Events
 
-The authz module emits proto events defined in [the Protobuf reference](../../../core/proto-docs.md#cosmos/authz/v1beta1/event.proto).
+The authz module emits proto events defined in [the Protobuf reference](https://buf.build/cosmos/cosmos-sdk/docs/main/cosmos.authz.v1beta1#cosmos.authz.v1beta1.EventGrant).