improve demo and hover rendering

[acao]

• finish the reorg @imolorhe started - consistent file names, move features to features directory
• switch to nodeResolution: bundler for esm, get rid of .js imports but still something newer than Node. keep nodeResolution: Node for cjs
• fix some issues with hover rendering, add hover rendering of $ref pointers! (see image)
• demo improvements - persist the edited values, use shema cache, remember the chosen schema, and change the headers based on the chosen schema (going to improve this further)
  

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[imolorhe]

Are we sure changing the module resolution wouldn't reintroduce issues? I see that we are removing the ".je" suffix which was added when fixing a reported issue with resolving the module