Using embed component in Pages, it is possible to embed Trello Public Board here is how

Step 1

From the browser, copy the URL

Step 2

In Claromentis, edit the page and find an Embed Component

Step 3

Select Type: Site (iframe)

and paste the URL, and remove the board name part of the URL and add .html

for example :

https://trello.com/b/OlkxiiYp/claromentis-public-board

to

https://trello.com/b/OlkxiiYp.html