Repo setup and build step configuration

.github/CODEOWNERS

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+* @movie-web/core

.github/CODE_OF_CONDUCT.md

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+Please visit the [main document at primary repository](https://github.com/movie-web/movie-web/blob/dev/.github/CODE_OF_CONDUCT.md).

.github/CONTRIBUTING.md

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+Please visit the [main document at primary repository](https://github.com/movie-web/movie-web/blob/dev/.github/CONTRIBUTING.md).

.github/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The movie-web maintainers only support the latest version of movie-web published at https://movie-web.app.
+This published version is equivalent to the master branch.
+
+Support is not provided for any forks or mirrors of movie-web.
+
+## Reporting a Vulnerability
+
+There are two ways you can contact the movie-web maintainers to report a vulnerability:
+ - Email [security@movie-web.app](mailto:security@movie-web.app)
+ - Report the vulnerability in the [movie-web Discord server](https://discord.movie-web.app)

.github/pull_request_template.md

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+This pull request resolves #XXX
+
+ - [ ] I have read and agreed to the [code of conduct](https://github.com/movie-web/movie-web/blob/dev/.github/CODE_OF_CONDUCT.md).
+ - [ ] I have read and complied with the [contributing guidelines](https://github.com/movie-web/movie-web/blob/dev/.github/CONTRIBUTING.md).
+ - [ ] What I'm implementing was assigned to me and is an [approved issue](https://github.com/movie-web/movie-web/issues?q=is%3Aopen+is%3Aissue+label%3Aapproved). For reference, please take a look at our [GitHub projects](https://github.com/movie-web/movie-web/projects).
+ - [ ] I have tested all of my changes.

.github/workflows/tests.yml

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+name: Testing
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - dev
+
+jobs:
+  testing:
+    name: Testing
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Install Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - name: Install packages
+      run: npm install
+
+    - name: Run tests
+      run: npm run test
+
+    - name: Run linting
+      run: npm run lint