Repeat home page pattern on top-level pages
Each page under **Use GitLab** is currently a bulleted list (for the most part), but a table would be nicer, and would match the pattern of the top-level pages.
We can start by putting the titles in a table. Let's not worry about the descriptions for now. (Maybe that can be a follow-up issue?)
Here is an example of the markdown:
```markdown
| | | |
|--|--|--|
| [**Manage your organization**](../topics/set_up_organization.md) **{chevron-right}**<br><br>Description.| | |
```
### Pages to update
**Fiona:**
- [x] Manage your organization
- [x] Organize work with projects
- [x] Plan and track work
- [x] Learn Git
- [x] Manage your code
**Suzanne:**
- [x] Use CI/CD to build your application
- [x] Secure your application
- [x] Deploy and release your application
- [x] Manage your infrastructure
- [x] Monitor your application
### Follow-up
Remove the carats and fix the spacing so it's closer to this layout. Keep it three columns.

**Fiona:**
- [x] Manage your organization
- [x] Organize work with projects
- [x] Plan and track work
- [x] Learn Git
- [x] Manage your code
- [x] Tutorials
- [x] Subscribe
- [x] Install
**Suzanne:**
- [x] Use CI/CD to build your application
- [x] Secure your application
- [x] Deploy and release your application
- [x] Manage your infrastructure
- [x] Monitor your application
- [x] Administer
- [x] Use GitLab
- [x] Extend
issue