doc: fix tracking_only link in README.md (#898)

### Briefly, what does this PR introduce?
This PR fixes a dead link on the README.

### What kind of change does this PR introduce?
- [x] Bug fix (issue: dead link)
- [ ] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No.

### Does this PR change default behavior?
No.

Author: wdconinc

README.md

@@ -7,7 +7,7 @@ Overview
 
 **Detector geometry:**
 - [Empty viewer](https://eic.github.io/epic/geoviewer)
-- Craterlake: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_craterlake.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [step](https://eic.github.io/epic//artifacts/epic_craterlake_no_bhcal.stp/epic_craterlake_no_bhcal.stp)
+- Craterlake: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_craterlake.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_craterlake.root) [step](https://eic.github.io/epic//artifacts/epic_craterlake_no_bhcal.stp/epic_craterlake_no_bhcal.stp)
 - Subsystems:
   - Inner detector: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_inner_detector.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_inner_detector.root)
   - Calorimetry: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_calorimeters.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_calorimeters.root)
@@ -16,7 +16,7 @@ Overview
     - dRICH: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_drich_only.root&item=default;1&opt=clipx;clipy;transp30;zoom75;ROTY290;ROTZ350;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_drich_only.root) [step](https://eic.github.io/epic//artifacts/epic_drich_only.stp/epic_drich_only.stp)
     - pfRICH: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_pfrich_only.root&item=default;1&opt=clipx;clipy;transp30;zoom55;ROTY49;ROTZ350;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_pfrich_only.root)
     - DIRC: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_dirc_only.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_dirc_only.root) [step](https://eic.github.io/epic//artifacts/epic_dirc_only.stp/epic_dirc_only.stp)
-  - Tracking: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_tracking_only.root&item=default;1&opt=clipx;clipy;transp30;zoom75;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_tracking_only.root) [step](https://eic.github.io/epic//artifacts/epic_craterlake_tracking_only.stp/epic_craterlake_tracking_only.stp)
+  - Tracking: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_craterlake_tracking_only.root&item=default;1&opt=clipx;clipy;transp30;zoom75;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_craterlake_tracking_only.root) [step](https://eic.github.io/epic//artifacts/epic_craterlake_tracking_only.stp/epic_craterlake_tracking_only.stp)
     - Vertex: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_vertex_only.root&item=default;1&opt=clipx;clipy;transp30;zoom120;ROTY320;ROTZ340;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_vertex_only.root)
     - TOF: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_tof_only.root&item=default;1&opt=clipx;clipy;transp30;zoom55;ROTY49;ROTZ350;trz0;trr0;ctrl;all) [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_tof_only.root)
   - Beamline: [viewer](https://eic.github.io/epic/geoviewer?nobrowser&file=artifacts/tgeo/epic_ip6.root&item=default;1&opt=clipx;clipy;transp30;zoom40;ROTY290;ROTZ350;trz0;trr0;ctrl;all)  [tgeo](https://eic.github.io/epic//artifacts/tgeo/epic_ip6.root) [step](https://eic.github.io/epic//artifacts/epic_ip6.stp/epic_ip6.stp)