doc/user: update "Tools and Integrations"

[morsapaes]

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Motivation

The refurbished "Tools and Integrations" page adds a great overview of the level of support for different tools in Materialize, but the content is a bit too heterogeneous. This PR suggests a few changes to improve readability and discoverability:

• Break sections with too many tools into sub-sections and give tools supported as sources and sinks a dedicated section (e.g. not including Redpanda under "Kafka").
• Instead of providing technical details under "Notes", more clearly state the status of the integration and link to existing guides or tracking issues for further details.
• Rewrite intro sections so that there's more consistency between sections and include technical details that are common to all tools in those sections (e.g. enabling logical replication is required for all listed PostgreSQL integrations, so it can be called out once instead of 10x).
• Make "Notify Me" buttons similar in style to the existing copy buttons.
• Remove trailing list of links at the bottom of the page.

@ruf-io, I couldn't figure out where to change the text of &.level-in-development (at least not without borking the icons!); if we made it "In Progress", we could avoid the line break.

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Once this is settled, the changes need to be backported to the lts-docs branch. As a follow-up, we should create the following integration guides:

• Heroku Kafka
• Redpanda Cloud
• SQL Server CDC (doc/user: SQL Server via Debezium CDC Guide #10989)
• Cube.js
• All tools under "Other tools" that have Alpha, Beta or In Development support level (e.g. Metabase, Superset, Hex)

[ruf-io]

This is way better!

To fix the s/in-development/in-progress/ issue, literally search and replace all occurrences of in-development:

1. In the key table at the top of page
2. In rows where it is used
3. in content.scss line 713
4. in inline-svgs.html line 4

[morsapaes]

in inline-svgs.html line 4

Ah! This was the bit I missed! Thank you, @ruf-io! Will change that and blend in your suggestions.