Recommend using Mamba to install CLIMADA (#809)

* Update installation instructions.
* Improve distinction between Mamba and Conda
* Recommend using Mamba instead of Conda. This includes downloading
  Miniforge instead of the Anaconda distribution. Warn about using
  conda.
* Add warning about removing a previous "simple" installation when
  switching to "advanced".
* Clarify nomenclature of "workspace directory".
* Mention that pip package should also be reinstalled

* Add Mamba instructions to README.md
* Update CHANGELOG.md


Co-authored-by: Sarah Hülsen <[email protected]>

Author: peanutfun

CHANGELOG.md

@@ -17,6 +17,7 @@ Code freeze date: YYYY-MM-DD
 - Add `shapes` argument to `geo_im_from_array` to allow flexible turning on/off of plotting coastline in `plot_intensity`. [#805](https://github.com/CLIMADA-project/climada_python/pull/805)
 - Update `CONTRIBUTING.md` to better explain types of contributions to this repository [#797](https://github.com/CLIMADA-project/climada_python/pull/797)
 - The default tile layer in Exposures maps is not Stamen Terrain anymore, but [CartoDB Positron](https://github.com/CartoDB/basemap-styles). Affected methods are `climada.engine.Impact.plot_basemap_eai_exposure`,`climada.engine.Impact.plot_basemap_impact_exposure` and `climada.entity.Exposures.plot_basemap`. [#798](https://github.com/CLIMADA-project/climada_python/pull/798)
+- Recommend using Mamba instead of Conda for installing CLIMADA [#809](https://github.com/CLIMADA-project/climada_python/pull/809)
 
 ### Fixed
 

README.md

@@ -21,13 +21,14 @@ This is the Python (3.9+) version of CLIMADA - please see [here](https://github.
 ## Getting started
 
 CLIMADA runs on Windows, macOS and Linux.
-The released versions of the CLIMADA core can be installed directly through Anaconda:
+The released versions of CLIMADA are available from [conda-forge](https://anaconda.org/conda-forge/climada).
+Use the [Mamba](https://mamba.readthedocs.io/en/latest/) package manager to install it:
 
 ```shell
-conda install -c conda-forge climada
+mamba install -c conda-forge climada
 ```
 
-It is **highly recommended** to install CLIMADA into a **separate** Anaconda environment.
+It is **highly recommended** to install CLIMADA into a **separate** Conda environment.
 See the [installation guide](https://climada-python.readthedocs.io/en/latest/guide/install.html) for further information.
 
 Follow the [tutorials](https://climada-python.readthedocs.io/en/stable/tutorial/1_main_climada.html) in a Jupyter Notebook to see what can be done with CLIMADA and how.