[nicolasiscoding]

The turbodocx-sdk gem is live on RubyGems (0.9.0). The Ruby pages were hidden behind draft: true and used the old one-page-per-language layout from before #185. This PR brings Ruby in line with the other languages.

• Ruby tab on every language tab group in the four product pages:

  Page	Ruby tabs
  turbosign.md	61
  deliverable.md	33
  quote.md	63
  webhooks.md	29

  • Every method, keyword argument, error class and constant was checked against packages/ruby-sdk/lib on SDK main. The old draft pages were used for wording only.
  • Where the gem has no equivalent (builders, client close, type classes), the tab says so instead of showing code.

• SDKs/ruby is now the install and configure page, like go.md. The URL is unchanged, so the gem's documentation_uri keeps working. It is added to the sidebar's Install & configure list.

• Old draft pages removed: deliverable-ruby, quote-ruby and webhooks-ruby. They were never published, so they need no redirects.

• partner-ruby is now unlisted, like the other partner pages, and links to the tabbed pages.

• SDKs/index: Ruby rows in all four product tables, plus Ruby tabs for install, first send and error handling.

• Other pages:

  • agent-skills and the TurboSign Webhooks page (Ruby SDK link plus a Sinatra verification tab).
  • "all six languages" becomes "seven" in quote and webhooks, which count JS and TS separately.

Not built locally; please check the PR preview.

Found while doing this, not fixed here:

• SDKs/index Java install still pins 0.7.0.
• The TurboSign Go field-type table says initials; the API value is initial.
• Quote Python, PHP, Go and Java tabs still say send needs a sender email; the backend now falls back to no-reply@turbodocx.com.
• Quote Python contact fields and bundle discount fields are stale.
• Quote validUntil example dates are in the past.
• The TurboSign Webhooks example tabs include .NET, which has no published SDK.

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