Add trademark disclaimer on the homepage footer (#46)

Signed-off-by: windsonsea <[email protected]>

content/en/_index.html

@@ -47,4 +47,10 @@
 <b>Merbridge is a <a href="https://www.cncf.io">Cloud Native Computing Foundation</a> sandbox project</b> <br />
 <br />
 <img src="https://landscape.cncf.io/images/cncf-landscape-horizontal-color.svg" width="600"/>
+
+<b>
+	The Linux Foundation has registered trademarks and uses trademarks.
+	For a list of trademarks of The Linux Foundation, please see our
+	<a href="https://www.linuxfoundation.org/legal/trademark-usage">Trademark Usage page</a>.
+</b>
 {{% /blocks/lead %}}

content/zh/_index.html

@@ -47,4 +47,9 @@
 <b>Merbridge 是一个<a href="https://www.cncf.io">云原生基金会 (CNCF)</a> 沙箱项目</b> <br />
 <br />
 <img src="https://landscape.cncf.io/images/cncf-landscape-horizontal-color.svg" width="600"/>
+
+<b>
+	Linux 基金会已注册商标并使用商标。有关 Linux 基金会的商标清单，
+	请参阅 <a href="https://www.linuxfoundation.org/legal/trademark-usage">Linux 基金会商标使用页面</a>。
+</b>
 {{% /blocks/lead %}}