chore: Enhance documentation for E2E testing:

- Added clarity and structure to README files, including recent updates and getting started sections.
- Improved manual verification documentation for CrowdSec authentication, emphasizing expected outputs and success criteria.
- Updated debugging guide with detailed output examples and automatic trace capture information.
- Refined best practices for E2E tests, focusing on efficient polling, locator strategies, and state management.
- Documented triage report for DNS Provider feature tests, highlighting issues fixed and test results before and after improvements.
- Revised E2E test writing guide to include when to use specific helper functions and patterns for better test reliability.
- Enhanced troubleshooting documentation with clear resolutions for common issues, including timeout and token configuration problems.
- Updated tests README to provide quick links and best practices for writing robust tests.

docs/features/dns-challenge.md

@@ -447,6 +447,7 @@ Charon displays instructions to remove the TXT record after certificate issuance
 **Symptom**: Certificate request stuck at "Waiting for Propagation" or validation fails.
 
 **Causes**:
+
 - DNS TTL is high (cached old records)
 - DNS provider has slow propagation
 - Regional DNS inconsistency
@@ -497,6 +498,7 @@ Charon displays instructions to remove the TXT record after certificate issuance
 **Symptom**: Connection test passes, but record creation fails.
 
 **Causes**:
+
 - API token has read-only permissions
 - Zone/domain not accessible with current credentials
 - Rate limiting or account restrictions
@@ -513,6 +515,7 @@ Charon displays instructions to remove the TXT record after certificate issuance
 **Symptom**: "Record already exists" error during certificate request.
 
 **Causes**:
+
 - Previous challenge attempt left orphaned record
 - Manual DNS record with same name exists
 - Another ACME client managing the same domain
@@ -551,6 +554,7 @@ Charon displays instructions to remove the TXT record after certificate issuance
 **Symptom**: "Too many requests" or "Rate limit exceeded" errors.
 
 **Causes**:
+
 - Too many certificate requests in short period
 - DNS provider API rate limits
 - Let's Encrypt rate limits