add more details on conda-based installations of Sage

[dimpase]

https://doc.sagemath.org/html/en/installation/conda.html#sec-installation-conda

assumes knowledge about Conda. In fact, we have enough details
on https://wiki.sagemath.org/Conda, but the link to it is only given
at the bottom of https://doc.sagemath.org/html/en/installation/conda.html#sec-installation-conda, and only in context of "Instructions for using Conda for SageMath development"

This should be fixed, and some parts of wiki copied there.

Also add how to update the conda environment later:
conda env update --file src/environment.yml --prune

See also:

• More updates for installation and developer guides #33088 More updates for installation and developer guides

Depends on #30845

CC: @isuruf @slel @tobiasdiez @dimpase

Component: documentation

Keywords: conda

Author: Matthias Koeppe

Branch/Commit: 516701d

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/33426

[slel]

comment:1

We should also mention the sagemath-forge Conda channel
whose base environment has Sage.

[slel]

Changed keywords from none to conda

[dimpase]

comment:2

Replying to @slel:

We should also mention the sagemath-forge Conda channel
whose base environment has Sage.

I don't know about it - can you add it somewhere - maybe on the wiki?

[mkoeppe]

Dependencies: #30845

[tobiasdiez]

comment:4

I also like the way scipy is doing it with having a very brief
https://scipy.github.io/devdocs/dev/contributor/quickerstart_conda.html#quickerstart-conda
quickstart, and a more detailed explanation
https://scipy.github.io/devdocs/dev/contributor/quickstart_ubuntu.html#quickstart-ubuntu

[mkoeppe]

comment:5

Yes, these look very nice.

[mkoeppe]

comment:6

We currently have the following entry points:

• Welcome to the SageMath Installation Guide
  (in the current version, shows a decision tree)

• https://github.com/sagemath/sage-prod/blob/develop/README.md

• https://doc.sagemath.org/html/en/developer/walk_through.html#obtaining-and-compiling-the-sage-source-code

• https://www.sagemath.org/download.html / https://www.sagemath.org/download-source.html / https://www.sagemath.org/download-latest.html

• https://www.sagemath.org/development.html

• https://wiki.sagemath.org/ReleaseTours/sage-9.6#Availability_of_Sage_9.6_and_installation_help / https://wiki.sagemath.org/ReleaseTours/sage-9.5#Availability_of_Sage_9.5_and_installation_help

[mkoeppe]

Description changed:

--- 
+++ 
@@ -5,3 +5,6 @@
 at the bottom of https://doc.sagemath.org/html/en/installation/conda.html#sec-installation-conda, and only in context of "Instructions for using Conda for [SageMath](../wiki/SageMath) development"
 
 This should be fixed, and some parts of wiki copied there.
+
+See also:
+- #33088 More updates for installation and developer guides

[tobiasdiez]

Description changed:

--- 
+++ 
@@ -6,5 +6,8 @@
 
 This should be fixed, and some parts of wiki copied there.
 
+Also add how to update the conda environment later:
+`conda env update --file src/environment.yml --prune`
+
 See also:
 - #33088 More updates for installation and developer guides

[mkoeppe]

Branch: u/mkoeppe/add_more_details_on_conda_based_installations_of_sage

[mkoeppe]

Commit: 8e363ef