chore: update logo (#1997)

The old Timefold Solver logo is still on the Timefold Solver repository.
Apparently I missed this when updating it for the quickstarts.

Author: TomCools

README.adoc

@@ -3,7 +3,7 @@
 :sonarLink: link="https://sonarcloud.io/dashboard?id={projectKey}"
 :branch: main
 
-image::docs/src/modules/ROOT/images/shared/timefold-logo.png[link="https://timefold.ai",Timefold,align="center"]
+image::docs/src/modules/ROOT/images/shared/timefold-solver-logo.png[link="https://solver.timefold.ai",Timefold,align="center"]
 
 _Planning optimization made easy._ +
 https://timefold.ai[timefold.ai]

docs/src/modules/ROOT/images/shared/timefold-solver-logo.png

@@ -2,7 +2,7 @@
 The Timefold Team <https://timefold.ai/company/about/>
 :doctype: book
 :imagesdir: .
-:title-logo-image: image:shared/timefold-logo.png[align="center"]
+:title-logo-image: image:shared/timefold-solver-logo.png[align="center"]
 :toc: left
 :toclevels: 3
 :sectnums:
@@ -18,7 +18,7 @@ The Timefold Team <https://timefold.ai/company/about/>
 
 // PDF uses :title-logo-image: on first page, no need to repeat image later on
 ifndef::backend-pdf[]
-image::shared/timefold-logo.png[align="center"]
+image::shared/timefold-solver-logo.png[align="center"]
 endif::[]
 
 include::introduction.adoc[leveloffset=+1]