Favicon, title, automatic & manual server naming (#2)

Server name may be set in config file. If unset, backend uses the folder name being served. This is shown in page title for site root, and subfolder names are also now shown. New icon of Droppy icon, changing only the color.

cista/api.py

@@ -89,7 +89,7 @@ async def watch(req, ws):
         msgspec.json.encode(
             {
                 "server": {
-                    "name": "Cista",  # Should be configurable
+                    "name": config.config.name or config.config.path.name,
                     "version": __version__,
                     "public": config.config.public,
                 },

cista/config.py

@@ -14,6 +14,7 @@ class Config(msgspec.Struct):
     listen: str
     secret: str = secrets.token_hex(12)
     public: bool = False
+    name: str = ""
     users: dict[str, User] = {}
     links: dict[str, Link] = {}