UI layout improvement

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Some design elements or source code can be referenced:

• https://sushiswap.fi/home
• https://startbootstrap.com/previews/sb-admin-2/
• https://github.com/StartBootstrap/startbootstrap-sb-admin-2
• https://dashboardpack.com/live-demo-preview/?livedemo=290&utm_source=adminlte&utm_medium=frontpage&v=24d22e03afb2 https://demos.creative-tim.com/bootstrap-vue-argon-dashboard-pro/#/dashboard

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icons： strategy: graph-up robot: cpu credential: key