enhancement: remove dependency on jinja2 for team page generation

[shaloo]

Followup to #45.

Currently, #45 is implemented using insights from @datapythonista / pandas team page which uses jinja2 for markdown processing and later integrates it with sphinx (which is jinja friendly). However, hugo does not recognise the jinja2 directives so cannot directly integrate team.md file into hugo. Figure out a better way to remove dependency on jinja2 and use Hugo's plugins / inbuilt systems to generate team.html page using GitHub info.