Add license to index page

content/_index.md

@@ -52,7 +52,7 @@ For more information on [字]{じ}ちゃん commands, see the [command list](#co
 
 ## Contact
 
-This site is operated by Elnu, who you can contact on Discord at [Elnu#2917](https://discord.com/users/441283734214279178). The source code for the website and bot are available [here](https://git.elnu.com/tegakituesday).
+This site is operated by Elnu, who you can contact on Discord at [Elnu#2917](https://discord.com/users/441283734214279178). The source code for the website and bot are available [here](https://git.elnu.com/tegakituesday). This site is source-available and the bot is under the GNU General Public License v3.0.
 
 {{< secondary >}}