update alt-text for 00-introduction

[zkamvar]

The two images in the introduction had alt text, but they did not accurately describe the images for screen readers.

I've added alt text that will give screen reader users a better understanding of what the images depict.

[github-actions[bot]]

Thank you!

Thank you for your pull request :smiley:

:robot: This automated message can help you check the rendered files in your submission for clarity. If you have any questions, please feel free to open an issue in {sandpaper}.

If you have files that automatically render output (e.g. R Markdown), then you should check for the following:

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• :framed_picture: correct figures
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Rendered Changes

:mag: Inspect the changes: https://github.com/carpentries-incubator/fair-research-software/compare/md-outputs..md-outputs-PR-73

The following changes were observed in the rendered markdown documents:

 00-introduction.md | 4 ++--
 md5sum.txt         | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

What does this mean?

If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible. This output provides a way for you to inspect the output in a diff-friendly manner so that it's easy to see the changes that occur due to new software versions or randomisation.

:stopwatch: Updated at 2024-06-25 13:25:14 +0000

[zkamvar]

I am never sure what to put for alt-text. Think I need some guidance on this - and others I expect as well.

No worries! It takes practice and that's why I put a callout in the Workbench Lesson: https://carpentries.github.io/sandpaper-docs/episodes.html#accessibility-point-alternative-text-aka-alt-text with a link to a slightly longer tutorial: https://axesslab.com/alt-texts/