[DOC] add logo for svg format

docs/_static/img/logo/logo.svg

@@ -0,0 +1,21 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 32">
+  <path fill="#308014"
+    d="M0 4v12h4c0 2.21 1.79 4 4 4s4-1.79 4-4h4v-4c-2.21 0-4-1.79-4-4s1.79-4 4-4V0H4a4 4 0 0 0-4 4z" />
+  <path fill="#fdd835"
+    d="M12 8c0 2.21 1.79 4 4 4v4h4c0-2.21 1.79-4 4-4s4 1.79 4 4h4V4a4 4 0 0 0-4-4H16v4c-2.21 0-4 1.79-4 4z" />
+  <path fill="#ddc825" d="M13 8c0-2.21 1.79-4 4-4V0h-1v4c-2.21 0-4 1.79-4 4s1.79 4 4 4v4h1v-4c-2.21 0-4-1.79-4-4z" />
+  <path fill="#FC4D00"
+    d="M0 16v12a4 4 0 0 0 4 4h12v-4c2.21 0 4-1.79 4-4s-1.79-4-4-4v-4h-4c0 2.21-1.79 4-4 4s-4-1.79-4-4H0z" />
+  <path fill="#DC3D00" d="M8 21c2.21 0 4-1.79 4-4h4v-1h-4c0 2.21-1.79 4-4 4s-4-1.79-4-4H0v1h4c0 2.21 1.79 4 4 4z" />
+  <path fill="#4B4FA6"
+    d="M20 24c0 2.21-1.79 4-4 4v4h12a4 4 0 0 0 4-4V16h-4c0-2.21-1.79-4-4-4s-4 1.79-4 4h-4v4c2.21 0 4 1.79 4 4z" />
+  <path fill="#3B3F96" d="M21 24c0-2.21-1.79-4-4-4v-4h-1v4c2.21 0 4 1.79 4 4s-1.79 4-4 4v4h1v-4c2.21 0 4-1.79 4-4z" />
+  <path fill="#3B3F96" d="M24 12c-2.21 0-4 1.79-4 4h-4v1h4c0-2.21 1.79-4 4-4s4 1.79 4 4h4v-1h-4c0-2.21-1.79-4-4-4z" />
+  <path fill="#fc4d00" d="M42.123 26.47H54.88v-3.404h-8.627V6.742h-4.129Z" />
+  <path fill="#4b4fa6"
+    d="M56.807 26.47h13.07v-3.404h-8.941v-4.963h8.435v-3.226h-8.435v-4.73h8.941V6.741h-13.07ZM71.012 26.47h4.334l4.935-15.9h1.258V6.742h-3.636zm3.705-4.785h11.225l-1.012-3.09h-9.201zm10.582 4.785h4.334L82.756 6.742h-2.393v3.828zM90.057 26.47h4.129v-7.15H97.494l3.678 7.15h4.676l-4.156-7.765q1.64-.643 2.597-2.16.971-1.518.971-3.46v-.027q0-1.982-.848-3.39-.834-1.422-2.42-2.174-1.572-.752-3.787-.752h-8.148Zm4.129-10.28V9.968h3.513q1.532 0 2.434.834.902.834.902 2.255v.028q0 1.449-.875 2.283-.861.82-2.406.82zM106.832 26.47h4.115V13.55h1.737l-3.46-2.61 10.747 15.53h3.582V6.742h-4.115v12.824h-1.723l3.459 2.612-10.732-15.436h-3.61z" />
+  <path fill="#fc4d00"
+    d="M130.58 26.47h4.033l3.637-13.22h.082l3.623 13.22h4.033l5.237-19.728h-4.28l-3.13 14.137h-.082l-3.637-14.137h-3.623l-3.637 14.137h-.082l-3.117-14.137h-4.28z" />
+  <path fill="#4b4fa6"
+    d="M151.02 26.47h4.334l4.935-15.9h1.258V6.742h-3.637zm3.705-4.785h11.224l-1.011-3.09h-9.201zm10.582 4.785h4.334l-6.877-19.728h-2.393v3.828zM170.065 26.47h4.129v-7.15H177.502l3.678 7.15h4.676l-4.157-7.765q1.641-.643 2.598-2.16.97-1.518.97-3.46v-.027q0-1.982-.847-3.39-.834-1.422-2.42-2.174-1.572-.752-3.787-.752h-8.148zm4.129-10.28V9.968h3.513q1.531 0 2.434.834.902.834.902 2.255v.028q0 1.449-.875 2.283-.861.82-2.406.82zM186.84 26.47h13.07v-3.404h-8.941v-4.963h8.436v-3.226h-8.436v-4.73h8.941V6.741h-13.07z" />
+</svg>