Provide a proper index, change logo to dark, since the top line is dark.

docs/make.jl

@@ -110,7 +110,7 @@ MultiDocumenter.make(
     ),
     brand_image = MultiDocumenter.BrandImage("https://juliamanifolds.github.io",
                                                               joinpath("assets",
-                                                                       "logo.png")),
+                                                                       "logo-dark.png")),
 )
 
 # ## Deploy

docs/src/index.md

@@ -1,3 +1,15 @@
 # Julia Manifolds
 
-Hi!
+The [GitHub Organisation Julia Manifolds](https://github.com/JuliaManifolds)
+develops [Julia]() packages involving numerical differential geometry.
+Our main interface is [ManifoldsBase.jl](https://juliamanifolds.github.io/manifoldsbase/stable/),
+describing how to define a manifold.
+The main package build upon that is a library of Riemannian manifolds, [Manifolds.jl](https://juliamanifolds.github.io/manifolds/stable/).
+On the other hand we provide packages that provide tools for general manifolds using the main interface, like
+[Manopt.jl](https://juliamanifolds.github.io/manopt/stable/) to perform optimization on Manifolds,
+[ManifoldDiffEq.jl](https://juliamanifolds.github.io/manifolddiffeq/) to solve differential equations,
+or [ManifoldDiff.jl](https://juliamanifolds.github.io/manifolddiff/stable/) to provide AD tools
+for functions deifned on manifolds.
+
+While all these packages have their own documentation, they are aggregated here as well using
+[MultiDocumenter.jl](https://github.com/JuliaComputing/MultiDocumenter.jl) to have a single place for all documentation, especially the overarching search functionality.