feat: modernize project

- Upgrade deps
- Migrate from jest to vitest
- Remove gatsby packages
- Support Node.js > 16

BREAKING CHANGE: Require Node.js v16

.eslintrc.json

@@ -8,13 +8,5 @@
   "parserOptions": {
     "ecmaVersion": 2022,
     "sourceType": "module"
-  },
-  "overrides": [
-    {
-      "files": ["*.test.?(m|t)js"],
-      "env": {
-        "jest": true
-      }
-    }
-  ]
+  }
 }

.github/workflows/ci.yml

@@ -61,7 +61,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [14, 16, 18]
+        node-version: [16, 18, 20]
 
     runs-on: ${{ matrix.os }}
 
@@ -75,10 +75,6 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
-      - name: Install last npm version
-        if: ${{ matrix.node-version == 14 }}
-        run: npm install -g npm@latest
-
       - name: Install dependencies
         run: npm ci
 
@@ -103,13 +99,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [14, 16, 18]
+        node-version: [16, 18, 20]
         os: [ubuntu-latest, macos-latest, windows-latest]
-        exclude:
-          # `npm i -g npm@latest` does not work
-          # It is not very critical if it does not work on windows/node-14
-          - os: windows-latest
-            node-version: 14
 
     runs-on: ${{ matrix.os }}
 
@@ -123,10 +114,6 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
-      - name: Install last npm version
-        if: ${{ matrix.node-version == 14 }}
-        run: npm install -g npm@latest
-
       - name: Install dependencies
         run: npm ci