feat: Reduce application bundle size

[x1unix]

Description

Lazy load some app components using <Suspense> to reduce main bundle size.

To avoid big refactoring - only core components moved into separate chunks.
Also Axios was removed as it proven to be not very useful and caused frequent security audit messages.

Those small improvements led to bundle size reduction by 17%.

Before

build/assets/index-F_QI-GM9.css              130.77 kB │ gzip:    22.71 
build/assets/index-BRqK_4MR.js             4,586.40 kB │ gzip: 1,239.06 kB

After

build/assets/Workspace-C4KlUbQ7.js               158.59 kB │ gzip:    50.93 kB
build/assets/PlaygroundContainer-DfuydaVG.js     570.66 kB │ gzip:   148.66 kB
build/assets/index-C9iGD47U.js                 3,816.40 kB │ gzip: 1,026.78 kB