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]

Branch: u/mkoeppe/add_more_details_on_conda_based_installations_of_sage

[mkoeppe]

Commit: 8e363ef

[mkoeppe]

New commits:

8e363ef

src/doc/en/installation/source.rst: Update conda sections from https://wiki.sagemath.org/Conda

[mkoeppe]

Author: Matthias Koeppe, ...

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

10015e6

src/doc/en/installation/conda.rst: Move everything on conda (except disabling it) here from source.rst

[sagetrac-git]

Changed commit from 8e363ef to 10015e6

[sagetrac-git]

Changed commit from 10015e6 to 6432a02

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

6432a02

src/doc/en/developer/walk_through.rst: Link also to ../installation/conda.html

[mkoeppe]

Changed author from Matthias Koeppe, ... to Matthias Koeppe

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

d190d13

src/doc/en/constructions/interface_issues.rst: Remove outdated short installation instructions

[sagetrac-git]

Changed commit from 6432a02 to d190d13

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

516701d

README.md: Use more specific link to 'Install from Source Code' section

[sagetrac-git]

Changed commit from d190d13 to 516701d

[dimpase]

Reviewer: Dima Pasechnik

[dimpase]

comment:17

OK, looks great, thanks!

[tobiasdiez]

comment:18

The link on the index page still goes to the wiki, which should be probably changed now that the relevant instructions are migrated. https://516701dbc7dd9738fb9d77ee3ac210c3919c8cb3--sagemath-tobias.netlify.app/installation/index.html

[mkoeppe]

comment:19

Thanks, I've put this on the list of things to do in #33088 as a follow-up.

[vbraun]

Changed branch from u/mkoeppe/add_more_details_on_conda_based_installations_of_sage to 516701d