Fix: remove upgrade paths table

[lena-larionova]

Description

The upgrade paths table in our documentation is massive and often incorrect. There are no new tests or findings for these paths in each release, so all the table says is to upgrade step by step to each minor version (3.4.x to 3.5.x to 3.6.x, etc). Additionally, this table is split by topology, but there is absolutely no difference in paths for each topology.

This table was added around 3.1 to cover the cover the websocket protocol changes between patches. However, this special case is already covered in https://docs.konghq.com/gateway/latest/upgrade/#upgrades-from-3100-or-3111.

I believe that simply adding examples to the list of supported guaranteed paths will serve the same purpose that the table once did, but in a much clearer way.

https://konghq.atlassian.net/browse/DOCU-3998
https://konghq.atlassian.net/browse/DOCU-4157

Testing instructions

Preview link: https://deploy-preview-8188--kongdocs.netlify.app/gateway/latest/upgrade/#preparation-choose-an-upgrade-path

Checklist

• Review label added
• Conditional version tags added, if applicable.

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