Add Hugo-based (https://gohugo.io) documentation

hugo/content/performance/comparison1.md

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+---
+title: Example Comparison with Ceph
+weight: 4
+---
+

hugo/content/performance/theoretical.md

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+---
+title: Vitastor's Theoretical Maximum Performance
+weight: 3
+---
+

hugo/content/performance/tuning.md

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+---
+title: Tuning
+weight: 2
+---
+

hugo/content/performance/understanding.md

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+---
+title: Understanding Storage Performance
+weight: 1
+---
+