Update Library Tiers Description

[prigiattiperrut]

Proposed changes

Added an introductory paragraph to the public documentation to clarify why we have tiers assigned to each library. This addition will help customers understand the criteria for each tier and the rationale behind their assignment.

Merge timing

ASAP once approved

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[forstisabella]

looks like the note covers some of the content on the page - could we convert the first sentences to a section in the Source Overview docs and then link to it?

[seg-atlantis-prod]

Plan Error

running git clone --branch develop --single-branch https://github.com/segmentio/segment-docs.git /home/atlantis/.atlantis/repos/segmentio/segment-docs/6917/default: Cloning into '/home/atlantis/.atlantis/repos/segmentio/segment-docs/6917/default'...
fatal: write error: No space left on device
fatal: fetch-pack: invalid index-pack output
: exit status 128

[pwseg]

looks like the note covers some of the content on the page - could we convert the first sentences to a section in the Source Overview docs and then link to it?

@forstisabella I like this idea a lot. I removed the new language from tier labels themselves and added them instead as a new section in the Sources overview page.

[github-actions]

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