feat: update g2p url (use public repo)

configs/g2p.yaml

@@ -1 +1 @@
-g2p: ${load_g2p:${gh_download:FormoSpeech/FormoLexicon, formosan/g2p.csv, ${oc.env:GH_TOKEN}}}
+g2p: ${load_g2p:${gh_download:FormoSpeech/FormoG2P, formosan/g2p.csv}}

ipa/__init__.py

@@ -23,9 +23,8 @@ EXTRA_G2P = {
 }
 
 
-def gh_download(repo, path, token):
+def gh_download(repo, path):
     headers = {
-        "Authorization": f"Bearer {token}",
         "Accept": "application/vnd.github.raw+json",
     }