DOCS: update Mermaid Chart page

[huynhicode]

:bookmark_tabs: Summary

This PR contains updates to the Mermaid Chart page.

Resolves # n/a

:straight_ruler: Design Decisions

Design decisions made by the Mermaid Chart team.

:clipboard: Tasks

Make sure you

• [x] :book: have read the contribution guidelines
• [ ] :computer: have added necessary unit/e2e tests.
• [ ] :notebook: have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [ ] :bookmark: targeted develop branch

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.81%. Comparing base (c562ca0) to head (76801ff). Report is 8 commits behind head on master.

Additional details and impacted files

[](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5495?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) ```diff @@ Coverage Diff @@ ## master #5495 +/- ## =========================================== + Coverage 5.74% 78.81% +73.06% =========================================== Files 276 175 -101 Lines 41886 14531 -27355 Branches 514 868 +354 =========================================== + Hits 2407 11452 +9045 + Misses 39479 2871 -36608 - Partials 0 208 +208 ``` | [Flag](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5495/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5495/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | `84.28% <ø> (?)` | | | [unit](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5495/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | `43.37% <ø> (+37.62%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js#carryforward-flags-in-the-pull-request-comment) to find out more. [see 273 files with indirect coverage changes](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5495/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js)