Update CONTRIBUTING.md post-repo-split (#1564)

* Cleanup outdated files

* Cleanup more outdated files and directories

* First draft of new setup instructions

* Update a bunch more of the CONTRIBUTING.md, remove outdated examples dir to avoid confusion

* Add direnv setup instructions

* More wording improvements to CONTRIBUTING.md

* Add link to sapling setup docs placeholder

* Update README to point to CONTRIBUTING

* Small wording fix

* Add tracking issues for remaining TODOs

* Fix markdown anchors in CONTRIBUTING

* Update name to FlexFlow Train in README

* Address review comments

* Add fix to gpu env entry command

* Remove clang-format CI matrix

* Re-add protobuf formatting exclude

Author: lockshaw

.editorconfig

@@ -20,3 +20,7 @@ indent_size = 4
 [*.toml]
 indent_style = space
 indent_size = 2
+
+[*.md]
+indent_style = space
+indent_size = 2

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,7 +9,3 @@ Linked Issues:
 
 Issues closed by this PR:
 - Closes #
-
-**Before merging:**
-
-- [ ] Did you update the [flexflow-third-party](https://github.com/flexflow/flexflow-third-party) repo, if modifying any of the Cmake files, the build configs, or the submodules?

.github/workflows/clang-format-check.yml

@@ -0,0 +1,13 @@
+name: clang-format
+on: [push, pull_request, workflow_dispatch]
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run clang-format style check for C/C++/Protobuf programs.
+        uses: lockshaw/[email protected]
+        with:
+          clang-format-version: "16"
+          exclude-regex: '\.proto$'