chore: fix README links, fix paywals typo

[Vlada-Q]

Two broken links, both from the shared README template.

• [All other integrations here](qonversion.io/integrations) has no scheme. GitHub renders it as a repository-relative path, so on the rendered README it resolves to github.com/qonversion/flutter-sdk/blob/main/qonversion.io/integrations and 404s. Now https://qonversion.io/integrations (200).
• https://documentation.qonversion.io/discuss-new in Have a question? is left over from readme.io and returns 404 — it is not among the redirects the docs site keeps. That is the link a reader follows when something did not work. It now points at https://qonversion.io/contact-us (200), next to the existing GitHub issues link. The same target is used in the other SDK READMEs so the support channel is one and the same everywhere.

Typo. «paywals» → «paywalls» in the A/B test bullet (it is copied across the READMEs).

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Scope is deliberately narrow: links, licence, install, typo. Positioning, the opening paragraph, the bullets, the banner images and the version badge are untouched — those belong to the README template being rewritten separately.

Opened from a fork, so the review request could not be set from here — @SpertsyanKM, this one is for you.

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• README.md

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📝 Walkthrough

Walkthrough

The README updates three lines. They qualify the integrations URL, correct “paywals” to “paywalls,” and replace the discussion link with the contact form link.

Changes

README Documentation Updates

Layer / File(s)	Summary
README link and text corrections README.md	The integrations link now uses https://. The A/B testing text uses “paywalls.” The contact option links to the contact form.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 1eb1a

The README links and wording are corrected without changing product behavior. This change is ready to merge.

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Behavior And Regression Safety	✅ Passed	The pull request changes only README.md. It replaces the relative integrations link with https://qonversion.io/integrations, replaces the obsolete support link with `https://qonversion.io/contact-us…
Security And Tenant Isolation	✅ Passed	PASS. The pull request changes only three README.md text lines: two documentation links and one spelling correction. The diff contains no authentication, authorization, tenant-scope, secret, personal-…
Contract And Data Compatibility	✅ Passed	The pull-request range changes only README.md. The patch updates two links and corrects the word “paywals” to “paywalls”. It changes no API, event, database, configuration, queue, or serialized-data…
Rollout And Recovery Evidence	✅ Passed	PASS: The pull request changes only README.md. The diff updates two documentation URLs and fixes the word “paywals” to “paywalls”. It does not change production behavior, configuration, infrastructure…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title identifies the affected README documentation area and states the behavioral outcomes: fixing links and correcting the “paywals” typo. It accurately summarizes the changes.

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