Documentation for Next-Gen SDK support

[postindustria-code]

• Add documentation for prebid-rendering integration
• Add documentation for original api integration

Documentation for the feature release prebid/prebid-mobile-android#925

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• For new adapters check submitting your adapter docs

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[postindustria-code]

I had to disable MD058 rule as it's conflicting with the current Kramdown IAL syntax. This rule requires a blank line before every table, while IAL must be placed directly adjacent to its target block - inserting a blank line between it and the table breaks the styling. HTML disable comments () were also considered, but Kramdown parses them as block-level elements, which breaks table rendering entirely. Existing files follow the same pattern for tables.

Is it fine, or should we consider a better solution?