Add environment variables to make it easy for anyone to host

.env.example

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+# All environment variables must be prefixed with VITE_ to be seen by client.
+
+# Self-hosted Services URLs.
+VITE_BANG_URL="https://bang."
+VITE_GITEA_URL="https://git."
+VITE_SEARXNG_URL="https://search."
+VITE_OPENWEBUI_URL="https://chat."
+
+# Set default bang here. For example "g" would be Google.
+# Google is the default if you don't set this.
+# 's' is for your searxng instance, replacing startpage
+VITE_DEFAULT_BANG="s"
+
+# SPECIFIC MODELS FOR OPENWEBUI
+# Local
+VITE_LLAMA_MODEL="llama3.1" # !llama
+VITE_DEEPSEEK_MODEL="deepseek-r1:8b" # !r1
+# Remote
+VITE_OPENAI_MODEL="gpt-4o-mini" # !openai
+VITE_CLAUDE_MODEL="anthropic/claude-3.5-sonnet" # !claude