WEB: Add table of content for the Ecosystem page

[datapythonista]

We did it for the PDEP pages here: #58791

I don't think it should be difficult to also add a table of contents for the ecosystem page, which is quite large and not so easy to find things

[akafle01]

Hi, I would like to work on this.

[Priya09153]

Hi, priya here
I would like to work on this issue