Merge branch 'master' into y_c_Beta

Author: vitkl

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Cell2location doesn’t do what it should? Please help us fix it!
+title: ''
+labels: bug
+assignees: ''
+---
+
+- [ ] I have confirmed this bug exists on the latest version of cell2location. See https://github.com/BayraktarLab/cell2location#installation
+- [ ] I follow the instructions from the [scvi-tools tutorial](https://cell2location.readthedocs.io/en/latest/notebooks/cell2location_tutorial.html).
+
+---
+
+**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) detailing how to provide the necessary information for us to reproduce your bug.
+
+
+### Minimal code sample (that we can run without your data, using public data)
+
+```python
+# Your code here
+```
+
+```pytb
+[Paste the error output produced by the above code here]
+```
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Cell2location Community Discussions
+    url: https://github.com/BayraktarLab/cell2location/discussions
+    about: Ask how to solve your problem using cell2location.

.github/ISSUE_TEMPLATE/enhancement-request.md

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+---
+name: Enhancement request
+about: Anything you’d like to see in cell2location?
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+<!-- Please describe your feature you would like to see below: -->
+...

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Usage Question
+about: Ask how to solve your problem using cell2location.
+title: ''
+labels: question
+assignees: ''
+---
+
+### Problem
+
+<!-- Please describe your problem below: -->
+...
+
+- [ ] I follow the instructions from the [cell2location tutorial (using on scvi-tools)](https://cell2location.readthedocs.io/en/latest/notebooks/cell2location_tutorial.html).
+- [ ] I have adjusted required hyperparameters to my dataset and tissue `N_cells_per_location` and `detection_alpha`.
+- [ ] I have provided 10X reaction/inlet as `batch_key` for reference NB regression.
+- [ ] I have checked [Cell2location Community Forum](https://github.com/BayraktarLab/cell2location/discussions), [scvi-tools forum](https://discourse.scvi-tools.org/) and did not find a solution
+
+
+### Description of the data input and hyperparameters
+
+<!-- Please briefly describe your : -->
+...
+
+<!-- Please briefly describe your spatial data: -->
+...
+
+#### Single cell reference data: number of cells, number of cell types, number of genes
+
+<!-- Please add this info: -->
+...
+
+#### Single cell reference data: technology type (e.g. mix of 10X 3' and 5')
+
+<!-- Please add this info: -->
+...
+
+#### Spatial data: number of locations numbers, technology type (e.g. Visium, ISS, Nanostring WTA)
+
+<!-- Please add this info: -->
+...