Certificates and CA certificates: references

[lena-larionova]

Fixes #226
Fixes #238.

Created to-do task #278 to track how-to topics.

How-tos for service-level certs and ca certs and a reference doc for cert types in Gateway + fixes to cert and ca cert entities.

Need help figuring out how to properly test and validate. Creating the entities and applying them to Gateway works fine, the validation is difficult.

Few other things that need adjusting:

• Can we set manual table widths? The last row of the last table on the SSL reference doc is getting squished.
• keys display weirdly in decK format examples:

Preview Links

https://deploy-preview-265--kongdeveloper.netlify.app/gateway/entities/certificate/
https://deploy-preview-265--kongdeveloper.netlify.app/gateway/entities/ca-certificate/
https://deploy-preview-265--kongdeveloper.netlify.app/gateway/ssl-certificates/

Checklist

• Every page is page one
• Tested how-to docs. If not, note why here. - never really figured out how to test properly, so I don't know how to validate
• All pages contain metadata
• Updated sources.yaml. For more info review track docs changes
• Any new docs link to existing docs.
• All autogenereted instructions render correctly (API, decK, Konnect). - need to fix the way that keys display in decK format
• Style guide (capital gateway entities, placeholder URLs) implemented correctly.

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[cloudjumpercat]

Changes needed:

• A few grammatical fixes and a few entity references were missing an inline link to the entity page.
• Two todo how tos are missing corresponding GH issues (or I couldn't find them).
• Change "SSL Certificate reference" title to something that hints more at use cases and quickly seeing how to setup SSL certs
• Descriptions from the "Configuring SSL connections through kong.conf" table should be moved to the kong.conf autogenerated source file. I'd prefer we link or use an autogenerated table instead of a manual table. This shouldn't hold up this PR though. We can note this to fix later and ship the table as-is.

Note: I also didn't test these code snippets since I read your note in the PR checklist about not knowing how to validate them.