Remove labelling workflow

Our bot glydr now does this automatically on the server-side, so this
isn't required.

.github/labeler.yml

@@ -1,11 +0,0 @@
-D-server: server/**/*
-D-libsky: libsky/**/*
-D-cli: cli/**/*
-C-docs: ./*.md
-D-build:
-  - ./*/*.toml
-  - ./*.toml
-  - ./*.lock
-D-workflow:
- - .github/*.yml
- - .github/**/*.yml

.github/workflows/label.yml

@@ -1,17 +0,0 @@
-# This workflow will triage pull requests and apply a label based on the
-# paths that are modified in the pull request.
-#
-# To use this workflow, you will need to set up a .github/labeler.yml
-# file with configuration.  For more information, see:
-# https://github.com/actions/labeler
-
-name: Labeler
-on: [pull_request]
-
-jobs:
-  triage:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/labeler@v2
-      with:
-        repo-token: "${{ secrets.TDBB }}"