doc: Make Protobuf-related docs more discoverable

The Protobuf-related docs are currently hosted in the `proto/` directory
due to historic reasons when `gitaly-proto` still had its own separate
repository. Let's modernize this a bit:

    - `README.md` is moved into `doc/protobuf.md`.
    - `CONTRIBUTING.md` is removed. We already have such a file in the
      root directory.
    - `DEPRECATION.md` is merged into `doc/PROCESS.md`.

This should hopefully help discoverability of this documentation.

4 files changed, 17 insertions, 28 deletions

diff --git a/doc/PROCESS.md b/doc/PROCESS.md
index 79a78e4c5..0563af48c 100644
--- a/doc/PROCESS.md
+++ b/doc/PROCESS.md
@@ -519,3 +519,20 @@ if you add patches to Gitaly's Makefile, you cannot assume that installations
 will always have these patches. As a result, all code which makes use of
 patched-in features must have fallback code to support the [minimum required Git
 version](../README.md#installation)
+
+### RPC deprecation process for gitaly-proto
+
+First create a deprecation issue at
+https://gitlab.com/gitlab-org/gitaly/issues with the title `Deprecate
+RPC FooBar`. Use label `Deprecation`. Below is a template for the
+issue description.
+
+```
+We are deprecating RPC FooBar because **REASONS**.
+
+- [ ] put a deprecation comment `// DEPRECATED: <ISSUE-LINK>` in ./proto **Merge Request LINK**
+- [ ] find all client-side uses of RPC and list below
+- [ ] update all client-side uses to no longer use RPC **ADD Merge Request LINKS**
+- [ ] wait for a GitLab release in which the RPC is no longer occurring in client side code **LINK TO GITLAB-CE RELEASE TAG**
+- [ ] delete the server side implementation of the old RPC in https://gitlab.com/gitlab-org/gitaly **Merge Request LINK**
+```
diff --git a/proto/README.md b/doc/protobuf.md
index 3fd40b5fc..3fd40b5fc 100644
--- a/proto/README.md
+++ b/doc/protobuf.md
diff --git a/proto/CONTRIBUTING.md b/proto/CONTRIBUTING.md
deleted file mode 100644
index 442c2b00c..000000000
--- a/proto/CONTRIBUTING.md
+++ /dev/null
@@ -1,12 +0,0 @@
-## Developer Certificate of Origin + License
-
-By contributing to GitLab B.V., You accept and agree to the following terms and
-conditions for Your present and future Contributions submitted to GitLab B.V.
-Except for the license granted herein to GitLab B.V. and recipients of software
-distributed by GitLab B.V., You reserve all right, title, and interest in and to
-Your Contributions. All Contributions are subject to the following DCO + License
-terms.
-
-[DCO + License](https://gitlab.com/gitlab-org/dco/blob/master/README.md)
-
-_This notice should stay as the first item in the CONTRIBUTING.md file._
diff --git a/proto/DEPRECATION.md b/proto/DEPRECATION.md
deleted file mode 100644
index 18bd0b44e..000000000
--- a/proto/DEPRECATION.md
+++ /dev/null
@@ -1,16 +0,0 @@
-# RPC deprecation process for gitaly-proto
-
-First create a deprecation issue at
-https://gitlab.com/gitlab-org/gitaly/issues with the title `Deprecate
-RPC FooBar`. Use label `Deprecation`. Below is a template for the
-issue description.
-
-```
-We are deprecating RPC FooBar because **REASONS**.
-
-- [ ] put a deprecation comment `// DEPRECATED: <ISSUE-LINK>` in ./proto **Merge Request LINK**
-- [ ] find all client-side uses of RPC and list below
-- [ ] update all client-side uses to no longer use RPC **ADD Merge Request LINKS**
-- [ ] wait for a GitLab release in which the RPC is no longer occurring in client side code **LINK TO GITLAB-CE RELEASE TAG**
-- [ ] delete the server side implementation of the old RPC in https://gitlab.com/gitlab-org/gitaly **Merge Request LINK**
-```