Refactor repository. Fixes #2161 (#2192)

* Remove duplicate LICENSE.
* Remove un-userd pyscript.sw directory and its content.
* Remove ReadTheDocs settings (unused).
* Remove un-used pyproject.toml
* Remove now unused CHANGELOG. Changes now tracked via release notes on GitHub.
* Updated / cleaned release page template and associated GH actions.
* Update prettierignore to remove un-needed refs.
* Move troubleshooting into correct README.
* Add reason for the index.html
* Rename the "pyscript.core" directory to "core".
* Update PR template because CHANGELOG is no longer used.
* Codespell configuration in pyproject.toml.
* Update pyscript.core -> core in .githubignore
* Remove test-results/.last-run.json. This should be ignored by git.
* Pin nodejs version.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

core/tests/python/helper.js

@@ -0,0 +1,23 @@
+const qs = new URLSearchParams(location.search);
+
+const src = './main.py';
+let config = './settings_mpy.json';
+
+// terminal=0 to NOT have a terminal
+const terminal = qs.has('terminal') ? qs.get('terminal') : 1;
+// worker=1 to have a worker
+const worker = qs.has('worker');
+
+const interpreter = qs.get('type') || 'mpy';
+if (interpreter === 'py') {
+    config = "./settings_py.json";
+}
+
+const script = document.createElement('script');
+script.type = interpreter;
+if (src) script.src = src;
+if (config) script.setAttribute('config', config);
+script.toggleAttribute('terminal', terminal);
+script.toggleAttribute('worker', worker);
+
+document.write(script.outerHTML);