Various fixes

[haampie]

• Fix Google Analytics token. Currently it's using the one from spack.readthedocs.io, which means the analytics from our docs are unreliable
• Ensure conf.py is in sync with spack/spack
• Use the same formatter as in spack/spack
• Fix a typo
• Fix Python/YAML style, and fix a few syntax errors related to it
• Fix includes of build system modules
• Fix include of a command output
• Enable warning = error to avoid issues in the future...

[Copilot]

Pull Request Overview

This PR applies various fixes to ensure the documentation is in sync with the main Spack repository and resolves formatting, style, and configuration issues.

• Fixes Google Analytics token to use tutorial-specific tracking instead of conflating with spack.readthedocs.io
• Updates conf.py configuration to match spack/spack and adds custom HTML formatter
• Applies consistent RST formatting throughout documentation files

Reviewed Changes

Copilot reviewed 19 out of 23 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
_templates/base.html	Updates Google Analytics tracking ID from shared to tutorial-specific
conf.py	Synchronizes configuration with spack/spack, adds custom HTML formatter, and updates extensions
.readthedocs.yaml	Enables fail_on_warning and adds post_checkout job for accurate timestamps
.gitmodules	Adds _spack_packages submodule reference
_spack_packages	Adds submodule commit reference
.github/workflows/style.yml	Updates style check workflow to install dependencies and use proper file selection
tutorial_*.rst files	Applies consistent RST formatting by breaking long lines and fixing indentation
common/setup.rst	Applies line formatting fixes
index.rst	Applies line formatting fixes

Comments suppressed due to low confidence (1)

conf.py:1

• The path appears to have an extra '/base' directory. Should be _spack_root/etc/spack/defaults/packages.yaml based on standard Spack directory structure.

# Copyright Spack Project Developers. See COPYRIGHT file for details.

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[alalazo]

Mostly LGTM, only a couple minor comments.

The notes at the top, with nested boxes, don't render very well: