[dpdk-web] [PATCH] add link for Soft Patch Panel documentation

[Ferruh Yigit]

 SPP documentation is now hosted on dpdk.org
 Adding link from doc.dpdk.org main page to SPP doc page.

Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
Cc: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
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 content/doc/_index.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/content/doc/_index.md b/content/doc/_index.md
index d226409..c28afcc 100644
--- a/content/doc/_index.md
+++ b/content/doc/_index.md
@@ -14,6 +14,7 @@ For a first try, you should follow the [quick start instructions](/doc/quick-sta
   {{< button href="//doc.dpdk.org/guides/linux_gsg/" >}} Linux User Guide {{< /button >}}
   {{< button href="//doc.dpdk.org/guides/prog_guide/" >}} Programmer's Guide {{< /button >}}
   {{< button href="//doc.dpdk.org/api/" >}} API Documentation {{< /button >}}
+  {{< button href="//doc.dpdk.org/spp/" >}} APPS - SPP {{< /button >}}
 
   ***Documentation is also available in [PDF format](//fast.dpdk.org/doc/pdf-guides/)***.
 </center>
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2.17.1