Cohort landing pages for Tech4Dev and UNDP, with forms saving to Google Sheets #397

What: Two cohort landing pages, at /cohorts/tech4dev/ (Local & Inclusive AI Cohort, closes 7 Nov) and /cohorts/undp/ (AI & Digital Tools for CSOs, closes 30 Nov). Each page's application form is in 4 steps. Tech4Dev also has an "Are we a fit?" check. Answers go straight into each cohort's Google Sheet, through an Apps Script web app.
Why it matters: Applications land in a Sheet that updates as they come in, with a column for each question. Nobody has to export them.
Evidence: PR #396. Preview: https://saqibmanan.github.io/cohorts/tech4dev/ and https://saqibmanan.github.io/cohorts/undp/. Real submissions from both pages reached the Sheets. At phone width, both pages fit the screen with no sideways scrolling and the forms check answers correctly. Not yet checked on a real phone.
Open: official Gram Vaani logo; CDL icons for the UNDP skill cards.