fix docs of meshery-nighthawk repos readme file broken images links

[ranjeetxsingh]

Description

This PR fixes #28 [docs] readme : broken images

Notes for Reviewers src url for images is changed to reflect correct path with same logos

Signed commits

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[leecalcote]

@ranjeetxsingh, thanks!

@gyohuangxin, teamwork. 🙂 Please merge at-will.

[gyohuangxin]

@leecalcote Sure, but I don't have the permission to merge it, can you give me it in this repo?

[welcome[bot]]

Thanks for your contribution to the Meshery! :tada:

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[leecalcote]

Yay! @ranjeetxsingh 🎈