Update Coretime Docs

[DrW3RK]

• [ ] With snapshots on Kusama network after it goes live
• [x] Add relevant cross-linking to other Wiki docs with definitions of keywords used -> https://github.com/w3f/polkadot-wiki/pull/5798
• [x] Accessible explanations for new learners/new comers to the ecosystem -> https://github.com/w3f/polkadot-wiki/pull/5798
• [x] Fetch on-chain constants/values wherever applicable -> https://github.com/w3f/polkadot-wiki/pull/5798
• [ ] Move "build" content to "build" section and PJS guides to their respective location on the Wiki -> #5811
• [ ] Improve RegionX and Lastic docs - add examples for partitioning, interlacing, transfers, and assigning tasks.