Closes: [#327](elastic/docs-projects#372) and
[#444](elastic/docs-projects#444)
Previews: [Ingest tools
overview](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/526/manage-data/ingest/tools)
and [Upload data
files](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/526/manage-data/ingest/upload-data-files)

### Summary

- As discussed, combined content from linked resources to add a table
for the tools overview. A lot of pages have moved around so I'd really
appreciate a quick double-check of the links to make sure they're
pointing to the right location 🙏
- Added content to the Upload data files page and changed its location
(see questions below)

### Questions

1. Since we decided that a table would work best for the overview, I'm
not sure how to incorporate
https://www.elastic.co/guide/en/cloud/current/ec-cloud-ingest-data.html
on this page. I don't think all of its content fits here based on the
new IA. Maybe it could go in the reference section? I'm open to any
ideas!!
2. The Upload data files page was originally nested under the Ingest
tools overview, but I think it's better suited as a sibling in the
overall Manage data/Ingest section. What do you think?