style(base-account): standardize callout formatting across documentation

[Earnwithalee7890]

What changed? Why?

This PR standardizes callout formatting across the Base Account documentation to ensure consistency and improve readability. The changes convert various callout styles (blockquotes, custom HTML, etc.) to the standard MDX callout components (<Note>, <Warning>, <Tip>, <Info>, etc.).

Files updated:

• Base Account documentation pages with inconsistent callout formatting
• All callouts now use standardized MDX components
• Consistent visual hierarchy for important information, warnings, tips, and notes

Standardizing callouts improves:

• Visual consistency across the documentation
• Maintainability by using a single, documented pattern
• User experience with predictable information hierarchy
• Accessibility through semantic markup

Notes to reviewers

• All callout content remains unchanged; only the formatting has been updated
• Callout types (<Note>, <Warning>, <Tip>, <Info>) were chosen based on the context and importance of the message
• Changes follow the established documentation style guide
• No functional changes to the documentation content

How has it been tested?

• Verified all callouts render correctly with the new format
• Confirmed visual consistency across all updated pages
• Validated that all MDX syntax is correct and builds successfully
• Reviewed callout types to ensure they match the semantic meaning of the content
• Checked that no content was lost or altered during the conversion

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/2	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2