Add ecosyste.ms search to OpenSustain.tech website

[Ly0n]

@andrew Created this awesome search function:
https://ost.ecosyste.ms/projects/search

We can add it as an iframe to OST similar like we are already doing it with the grist spreadsheet integration here:
https://opensustain.tech/spreadsheet/

[andrew]

So what I think we need here is an extra parameter for the search page that hides the header and footer, and maybe also uses the opensustain.tech stylesheet

[andrew]

I also made a json api endpoint for the search: https://ost.ecosyste.ms/api/v1/projects/search?query=solar