"I'm feeling lucky" mode on search

[shuuji3]

Currently, even when users want to visit the specific package via keyword search, users need to type package name and click the top result.

The "I'm feeling lucky" mode would work like this:

• Add feeling-lucky=1 param to the search URL (example: https://npmx.dev/search?feeling-lucky=1&q=nuxt)
• When there is the exact match result, instead of showing the package list, directly navigate users to that package page (example: https://npmx.dev/package/nuxt)
• If no exact match result, show the search result as is.

Users may add two search keywords if they prefer, for example:

• npmx <keyword> -> https://npmx.dev/search?q=%s
• npmx! <keyword> -> https://npmx.dev/search?feeling-lucky=1&q=%s

Users could add npmx! <keyword> -> https://npmx.dev/package/%s but this mode can provide a bit more flexible fallback.

inspired by this shared post: https://bskye.app/profile/vale.rocks/post/3me3elmhxo22j (via https://discord.com/channels/1464542801676206113/1466869459590451448/1468855092894498877)