Fix images not showing on website

[geriom]

Changes

Fixes Triggers diagram not showing on the landing page.

• Updates the sync script. If the image is not found locally, the src is updated to the corresponding raw file on the repo.
• Increase the GitHub buffer size to fix building errors.
• Updates the unit tests.

It's not the cleanest solution but it works.

Tekton Triggers landing page preview

/closes #340 /closes #453

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[geriom]

😮‍💨 No idea why the build is failing. I'm going to double-check. (cue in the "it works on my machine" meme)

cmdline: git clone -v -- https://github.com/tektoncd/results /opt/build/repo/sync/.cache/results
RPC failed; HTTP 500 curl 22 The requested URL returned error: 500
error: RPC failed; HTTP 500 curl 22 The requested URL returned error: 500

Apparently we have to increase the github buffer size?

[geriom]

Thanks @geriom, this looks great! Would you mind adding a unit test for the changes so that we do not break it in future?

@afrittoli I added a test.

I also noticed that transform_links_doc lacks the assert statement and that just adding it is not enough. I opened #492 to track that, I saw that you did some work on that and I'm planning to take a closer look, but I'm not sure if this requires a lot of work to fix.

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This pull-request has been approved by: afrittoli

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