Feature/optimizations

[godcl1623]

Made some changes to optimize the app.

1. Make interactive graph properly renewed on page navigation Used next/dynamic to dynamically import CytoscapeComponent component.

2. Fixed object id changes on every navigation FolderTree has folded on every second page move, possible reason seems to be object id change, since _counter variable's value incremented on every page move. Changed object id by thisObject.name, it seems FolderTree works well.

3. Add cache to increase build speed If number of posts increased over hundreds, build speed slowed down(e.g. about 9 minutes for 300+ files). By replacing convertObject(getDirectoryData()) in getStaticProps to cache, build speed increased(e.g. about 27 seconds for 300+ files).

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