feat: remove github ci due to nightly features

.github/workflows/ci.yml

@@ -1,36 +0,0 @@
-name: Check
-
-on: push
-
-env:
-    CARGO_TERM_COLOR: always
-
-jobs:
-    check:
-        runs-on: ubuntu-latest
-        name: Check
-        steps:
-            - uses: actions/checkout@v3
-            - name: cargo check
-              run: cargo check
-    test:
-        runs-on: ubuntu-latest
-        name: Test
-        steps:
-            - uses: actions/checkout@v3
-            - name: cargo test
-              run: cargo test
-    clippy:
-        runs-on: ubuntu-latest
-        name: Lint (clippy)
-        steps:
-            - uses: actions/checkout@v3
-            - name: cargo clippy
-              run: cargo clippy -- -D warnings
-    fmt:
-        runs-on: ubuntu-latest
-        name: Format
-        steps:
-            - uses: actions/checkout@v3
-            - name: cargo fmt
-              run: cargo fmt --check