add deltalake to eco system doc page
- [x] relates to #35017
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them

Thanks @houqp. CI failures unrelated  @mroeschke @jreback I am not seeing this change show up in the official doc, do you know what did I miss in my PR? this will be in 1.3 releasing soon  you can see the changes at https://pandas.pydata.org/pandas-docs/dev/ecosystem.html?highlight=ecosystem#deltalake thank you @jreback @simonjayhawkins for the context and confirmation!