Change title of index navbar.
Change title of index navbar.

sugiuraii/PixiJS-Websocket-typescriptStudy,sugiuraii/WebSocketGaugeClientNeo,sugiuraii/PixiJS-Websocket-typescriptStudy,sugiuraii/WebSocketGaugeClientNeo,sugiuraii/WebSocketGaugeClientNeo,sugiuraii/PixiJS-Websocket-typescriptStudy