chore: Remove settings.yml in favour of hs-github-tools.

Centralised settings means we can update them without having to pass all
the CI checks of each repo.

.github/settings.yml

@@ -1,86 +0,0 @@
----
-_extends: .github
-
-repository:
-  name: c-toxcore
-  description: The future of online communications.
-  homepage: https://tox.chat/
-  topics: toxcore, network, p2p, security, encryption, cryptography
-
-branches:
-  - name: "master"
-    protection:
-      required_status_checks:
-        contexts:
-          - "analysis (autotools)"
-          - "analysis (clang-tidy)"
-          - "analysis (compcert)"
-          - "analysis (cppcheck)"
-          - "analysis (doxygen)"
-          - "analysis (misra)"
-          - "analysis (tcc)"
-          - "analysis (tokstyle)"
-          - "bazel-dbg"
-          - "bazel-opt"
-          - "build-android"
-          - "build-macos"
-          - "build-windows (32)"
-          - "build-windows (64)"
-          - "ci/circleci: asan"
-          - "ci/circleci: bazel-asan"
-          - "ci/circleci: bazel-msan"
-          - "ci/circleci: bazel-tsan"
-          - "ci/circleci: clang-analyze"
-          - "ci/circleci: cpplint"
-          - "ci/circleci: infer"
-          - "ci/circleci: static-analysis"
-          - "ci/circleci: tsan"
-          - "ci/circleci: ubsan"
-          - "cimple"
-          - "cimplefmt"
-          - "CodeFactor"
-          - "code-review/reviewable"
-          - "common / buildifier"
-          - "coverage-linux"
-          - "docker-bootstrap-node"
-          - "docker-bootstrap-node-websocket"
-          - "docker-clusterfuzz"
-          - "docker-esp32"
-          - "docker-fuzzer"
-          - "docker-toxcore-js"
-          - "docker-win32"
-          - "docker-win64"
-          - "freebsd"
-          - "Hound"
-          - "mypy"
-          - "program-analysis"
-          - "sonar-scan"
-          - "TokTok.c-toxcore"
-          - "TokTok.c-toxcore (windows_msvc_conan shared)"
-          - "TokTok.c-toxcore (windows_msvc_conan static)"
-
-# Labels specific to c-toxcore.
-labels:
-  - name: "bootstrap"
-    color: "#01707f"
-    description: "Bootstrap"
-
-  - name: "crypto"
-    color: "#1d76db"
-    description: "Crypto"
-
-  - name: "file transfers"
-    color: "#e02abf"
-    description: "File Transfers"
-
-  - name: "messenger"
-    color: "#d93f0b"
-    description: "Messenger"
-
-  - name: "network"
-    color: "#d4c5f9"
-    description: "Network"
-
-  - name: "toxav"
-    color: "#0052cc"
-    description: "Audio/video"