docs: cleanup docs (#4434)

## Changes Made

- [x] Merge terms & core concepts
- [x] Update colors & logos
- [x] Update Daft messaging across docs

See build here:
https://www.getdaft.io/projects/docs/en/chanchan-docs-cleanup/ (logo in
favicon will update once merged to main)

## Checklist

- [ ] Documented in API Docs (if applicable)
- [ ] Documented in User Guide (if applicable)
- [ ] If adding a new documentation page, doc is added to
`docs/mkdocs.yml` navigation
- [ ] Documentation builds and is formatted properly (tag @/ccmao1130
for docs review)

Author: ccmao1130

docs/api/config.md

@@ -38,7 +38,7 @@ Configure Daft in various ways during execution.
 
 Configure behavior when Daft interacts with storage (e.g. credentials, retry policies and various other knobs to control performance/resource usage)
 
-These configurations are most often used as inputs to Daft DataFrame reading I/O functions such as in [I/O](io.md).
+These configurations are most often used as inputs to Daft when reading I/O functions such as in [I/O](io.md).
 
 ::: daft.daft.IOConfig
     options: