chore: fix image links in clickhouse docs

[lpmi-13]

Summary

The image links in the clickhouse data viz docs were broken. This commits fixes them. I can also center the images if that would be preferable than the default, which is left-aligned.

I also fixed a couple double spaces after periods, but I can rebase that out if you prefer.

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js (N/A)
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx (N/A)

[CLAassistant]

All committers have signed the CLA.

[iamKunalGupta]

The images are loading fine for me, but good to have it in the new syntax anyways.

Thanks for your contribution!

[lpmi-13]

Ah right...sorry, should have included screenshots indicating I was referring to the github repo markdown specifically.

The pictures load fine on the main docs site, but I got directed to this repo during googling and was surprised that the images didn't show up.