docs: `integrations/memory` consistency (#10255)
- updated titles and descriptions of the `integrations/memory` notebooks
into consistent and laconic format;
- removed
`docs/extras/integrations/memory/motorhead_memory_managed.ipynb` file as
a duplicate of the
`docs/extras/integrations/memory/motorhead_memory.ipynb`;
- added `integrations/providers` Integration Cards for `dynamodb`,
`motorhead`.
- updated `integrations/providers/redis.mdx` with links
- renamed several notebooks; updated `vercel.json` to reroute new names.
