feat: Block AI user agents (#1145)

* feat: Block AI user agents

* fix the syntax and format of robots.txt

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

public/robots_allow.txt

@@ -1,4 +1,97 @@
 Sitemap: https://digital.library.ucla.edu/sitemap.xml
 
-User-agent: *
-Disallow:
+User-agent: AdsBot-Google
+Disallow: /
+
+User-agent: Amazonbot
+Disallow: /
+
+User-agent: anthropic-ai
+Disallow: /
+
+User-agent: Applebot
+Disallow: /
+
+User-agent: AwarioRssBot
+Disallow: /
+
+User-agent: AwarioSmartBot
+Disallow: /
+
+User-agent: Bytespider
+Disallow: /
+
+User-agent: CCBot
+Disallow: /
+
+User-agent: ChatGPT-User
+Disallow: /
+
+User-agent: ClaudeBot
+Disallow: /
+
+User-agent: Claude-Web
+Disallow: /
+
+User-agent: cohere-ai
+Disallow: /
+
+User-agent: DataForSeoBot
+Disallow: /
+
+User-agent: Diffbot
+Disallow: /
+
+User-agent: FacebookBot
+Disallow: /
+
+User-agent: FriendlyCrawler
+Disallow: /
+
+User-agent: Google-Extended
+Disallow: /
+
+User-agent: GoogleOther
+Disallow: /
+
+User-agent: GPTBot
+Disallow: /
+
+User-agent: img2dataset
+Disallow: /
+
+User-agent: ImagesiftBot
+Disallow: /
+
+User-agent: magpie-crawler
+Disallow: /
+
+User-agent: Meltwater
+Disallow: /
+
+User-agent: omgili
+Disallow: /
+
+User-agent: omgilibot
+Disallow: /
+
+User-agent: peer39_crawler
+Disallow: /
+
+User-agent: peer39_crawler/1.0
+Disallow: /
+
+User-agent: PerplexityBot
+Disallow: /
+
+User-agent: PiplBot
+Disallow: /
+
+User-agent: scoop.it
+Disallow: /
+
+User-agent: Seekr
+Disallow: /
+
+User-agent: YouBot
+Disallow: /