MRG: Recommend mamba instead of libmamba for installation (#10597)

* Recommend mamba instead of libmamba for installation [skip actions][skip azp]

Followup for #10580

cc @marsipu

* Fix RST [skip azp][skip actions]

doc/install/manual_install.rst

@@ -19,9 +19,8 @@ We suggest to install MNE-Python into its own ``conda`` environment.
 
 The dependency stack is large and may take a long time (several tens of
 minutes) to resolve on some systems via the default ``conda`` solver. We
-therefore highly recommend using the
-`libmamba solver <https://www.anaconda.com/blog/a-faster-conda-for-a-growing-community>`__,
-which is **much** faster, albeit still an experimental feature.
+therefore highly recommend using `mamba <https://mamba.readthedocs.io/>`__
+instead, a ``conda`` replacement that is **much** faster.
 
 Run in your terminal …
 

doc/install/manual_install_platform_selector.html

@@ -14,8 +14,8 @@ <h5 class="m-0 font-weight-bold">
             data-parent="#platformSelectorAccordion">
             <div class="card-body">
                 <div class="highlight highlight-console notranslate">
-                    <pre><span class="gp">$ </span>conda install --name<span class="o">=</span>base conda-libmamba-solver
-<span class="gp">$ </span>conda create --experimental-solver<span class="o">=</span>libmamba --strict-channel-priority --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>mne mne</pre>
+                    <pre><span class="gp">$ </span>conda install --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>base mamba
+<span class="gp">$ </span>mamba create --strict-channel-priority --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>mne mne</pre>
                 </div>
             </div>
         </div>
@@ -41,12 +41,11 @@ <h5 class="m-0 font-weight-bold">
                 <p>
                     The procedure consists of two main steps: First we create the environment from Intel-based packages.
                     Then, we configure the environment to always use Intel packages even for future installations,
-                    should
-                    you decide to install any additional packages into the same <code>conda</code> environment.
+                    should you decide to install any additional packages into the same <code>conda</code> environment.
                 </p>
                 <div class="highlight highlight-console notranslate">
-                    <pre><span class="gp">$ </span>conda install --name<span class="o">=</span>base conda-libmamba-solver
-<span class="gp">$ </span>CONDA_SUBDIR<span class="o">=</span>osx-64 conda create --experimental-solver<span class="o">=</span>libmamba --strict-channel-priority --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>mne mne
+                    <pre><span class="gp">$ </span>conda install --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>base mamba
+<span class="gp">$ </span>CONDA_SUBDIR<span class="o">=</span>osx-64 mamba create --strict-channel-priority --channel<span class="o">=</span>conda-forge --name<span class="o">=</span>mne mne
 <span class="gp">$ </span>conda activate mne
 <span class="gp">$ </span>conda config --env --set subdir osx-64</pre>
                 </div>