🧑‍💻 Dev: add PR templates for general contributions and add new plots

.github/pull_request_templates/general.md

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+### Description
+[General purpose description]
+
+### Changes
+[List of changes made on this PR]
+- 

.github/pull_request_templates/new_plot.md

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+### Description
+Adds new [PlotName] Plotly visualization
+
+### Tasks Checklist
+- [ ] Create **Pydantic schema** in the `vuecore/schemas` folder. It should be aligned with the [plotly API](https://plotly.com/python-api-reference/index.html)
+- [ ]  Create a script with a **build function** in the `vuecore/engines/plotly` folder
+- [ ] Update `theming.py` script in the `vuecore/engines/plotly` folder
+- [ ] Register the new **builder** in the _`_init__.py` script of the `vuecore/engines/plotly` folder
+- [ ] Create a script with the **user-facing function** in the `vuecore/plots` folder. It gathers the Pydantic schema, builder function, and saves the plot
+- [ ] Create an **api example jupyter notebook** in the `docs/api_examples folder`
+- [ ] Use **jupytext** to sync the Jupyter notebook with a Python script
+- [ ] Update `index.md` file in the `docs` folder with the new example
+- [ ] Create **test script** in the `/test` folder with the code from the example