Refactored Index.js of theme/navbar

[hamidayubdev]

Simplified logic of returning Logo component in theme/navbar/logo/index.js by removing empty early return.

Refactored openMenu function in theme/navbar/index.js.

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[andrewnicols]

Sorry but this doesn’t work in all situations.

Our version numbers have three parts and this normalises them to extract just the first two.

[hamidayubdev]

@andrewnicols Which one doesn't work in all situations?
This (refactored getVersion function to directly use versionName ...) commit?