Add things that quickdoc supports

This quickdoc: https://github.com/heyLu/quickdoc/blob/master/quickdoc.go

zig/sdl/hello_sdl.zig

    const argv = if (std.mem.startsWith(u8, cmd, "go "))
        &[_][]const u8{ "go", "doc", cmd[3..] }
    else if (std.mem.startsWith(u8, cmd, "py "))
        &[_][]const u8{ "python", "-c", try std.fmt.allocPrint(allocator, "import {s}; help({s});", .{ cmd["py ".len..], cmd["py ".len..] }) }
        &[_][]const u8{ "python", "-c", try std.fmt.allocPrint(allocator, "import {s}; help({s});", .{ std.mem.sliceTo(cmd["py ".len..], '.'), cmd["py ".len..] }) }
    else if (std.mem.endsWith(u8, cmd, " --help"))
        // TODO: handle --help that outputs on stderr
        &[_][]const u8{ cmd[0..(cmd.len - " --help".len)], "--help" }
    else if (std.mem.startsWith(u8, cmd, "man "))
        // TODO: handle `man 5 sway`
        &[_][]const u8{ "man", cmd["man ".len..] }
    else
        &[_][]const u8{ "/usr/bin/qalc", "-terse", cmd };
    for (argv) |arg| {