HomePage uses Params.urlFunc + Based on HomePage relLink (#872)
### Prerequisites
Put an `x` into the box(es) that apply:
- [x] This pull request fixes a bug.
- [ ] This pull request adds a feature.
- [ ] This pull request introduces breaking change.
### Description
Use urlFunc on homepage link + refer to .Site.Home instead of
.Site.BaseURL
+ explicitly use .Site as . for clarity
### Issues Resolved
fix #871
### Checklist
Put an `x` into the box(es) that apply:
#### General
- [x] Describe what changes are being made
- [x] Explain why and how the changes were necessary and implemented
respectively
- [x] Reference issue with `#<ISSUE_NO>` if applicable
#### Resources
- [ ] If you have changed any SCSS code, run `make release` to
regenerate all CSS files
#### Contributors
- [x] Add yourself to `CONTRIBUTORS.md` if you aren't on it already
- [x] Linted the file as an optional task
---------
Co-authored-by: Luiz F. A. de Prá <luizdepra@users.noreply.github.com>