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Yes, you can develop in any language on Raspberry Pi. By default it comes with Raspberry Pi OS, which is based on Debian, which is Linux, which is the most widely used server OS (kernel).
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Well, yes, especially if your website is an interactive one (and not just a static page with some links and images). For example, you could accidentally code your server to expose the time zone or the real IP of the server to the users of your website. Or there can be a generic security vulnerability, like remote code execution.
But for static websites there’s less stuff that you can mess up.I’m not sure where the question comes from. But yeah, you just write the website and upload it to the server, with SSH (SCP).
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AFAIK Onionshare is a purely client-side app. It’s a somewhat thin GUI wrapper around Tor. So the Onion site is actually hosted on your machine, it’s not like a VPS. See How OnionShare Works — OnionShare 2.6 documentation.
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