Rework Branching and CI/CD Pipeline (#24)

The old branching system was way too complicated and not flexible (in terms of ci/cd). We now have a single main branch and all changes to the codebase will be done via pull requests and issues. A few changes were also done to the ci/cd pipeline:
- the changelog action was removed and replaced by the release-changelog
- when creating a pull request, the code will be checked for formatting, tests, and compiling
- as soon as a tag is pushed, a release will be automatically created
- when creating a release, the code will be published to crates.io

.github/deadpendency.yaml

@@ -0,0 +1,3 @@
+ignore-failures:
+  rust:
+    - lazy_static

.github/release.yml

@@ -0,0 +1,17 @@
+changelog:
+  exclude:
+    authors:
+      - allcontributors
+  categories:
+    - title: Breaking Changes 🛠
+      labels:
+        - breaking-change
+    - title: Exciting New Features 🎉
+      labels:
+        - enhancement
+    - title: Bug Fixes 🐛
+      labels:
+        - bug
+    - title: Other Changes
+      labels:
+        - "*"

.github/stale.yml

@@ -0,0 +1,10 @@
+daysUntilStale: 60
+daysUntilClose: 7
+exemptLabels:
+  - pinned
+  - security
+staleLabel: stale
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.

.github/workflows/cd.yml

@@ -0,0 +1,54 @@
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+name: Continuous Deployment
+
+jobs:
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: softprops/action/gh/release@v2
+        with:
+          files: LICENSE.txt
+          token: ${{ secrets.GITHUB_TOKEN }}
+          generate_release_notes: true
+
+  upload-assets:
+    name: Upload Assets
+    needs: release
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: taiki-e/upload-rust-binary-action@v1
+        with:
+          bin: wiki-tui
+          tar: all
+          zip: windows
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  publish:
+    name: Publish to crates.io
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: publish
+          args: --token ${CRATES_TOKEN}
+        env:
+          CRATES_TOKEN: ${{ secrets.CRATES_TOKEN }}

.github/workflows/ci.yml

@@ -0,0 +1,86 @@
+on:
+  pull_request:
+
+name: Continuous Integration
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release
+
+  check:
+    name: Clippy Check
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: clippy
+          override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --release
+
+  format:
+    name: Check formatting
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          components: rustfmt
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check