Remove older Django and Python versions and improvements

* Drop support to Python 2 and Python < 3.5 that are unmaintained and insecure.
* Drop support to Django < 2.2 that also reach end of mainstream support (insecure).
* Drop included jQuery version used in favor of built-in `django.jQuery` in Django that is more up to date and maintained by Django, making also the library less vulnerable.
* Fix margin in "chips", specially margin top was 0, making it ugly.
* Fix Tox and Selenium configurations. Replace PhantomJS with Chrome (PhantomJS support was removed in newer versions of Selenium).
* Replace Travis CI with GitHub Actions: Travis is fading out its commitment with OSS, making the service for no-paid projects each time slower and less available. On the other hand GH Actions is free and fast even for OSS projects.
* Remove IDE configurations that are "user" related.

Author: mrsarm

.github/workflows/python-tox.yml

@@ -0,0 +1,23 @@
+name: Python package
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.5', '3.10']
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install tox tox-gh-actions
+    - name: Test with tox
+      run: tox

.gitignore

@@ -9,6 +9,8 @@ __pycache__/
 .Python
 env/
 .env/
+venv/
+.venv/
 build/
 develop-eggs/
 dist/