Tidy docs homepage including link to GitHub issues (#771)

* Add bug and dev docs links to homepage

* remove space

* 3 rows of buttons

* Tidy homepage links and add emojis

* Update Pygambit tagline

Author: edwardchalstrey1

doc/developer.contributing.rst

@@ -6,6 +6,8 @@ Contributing to Gambit
 This section provides guidelines for contributing to Gambit, including how to report bugs, suggest features, and contribute code.
 It includes information relevant to both core developers and external contributors.
 
+.. _github-issues:
+
 GitHub issues
 -------------
 

doc/index.rst

@@ -8,10 +8,11 @@ We recommended most new users install the PyGambit Python package and read the a
 
 .. grid::
 
-   .. grid-item-card:: Installing Gambit
-      :columns: 6
+   .. grid-item-card:: ⬇️ Installing Gambit
+      :columns: 4
 
-      Get started by installing Gambit. PyGambit quickstart: ``pip install pygambit``
+      Quick installation with PyGambit:
+      ``pip install pygambit``
 
       .. button-ref:: install
          :ref-type: ref
@@ -20,10 +21,10 @@ We recommended most new users install the PyGambit Python package and read the a
          :expand:
 
 
-   .. grid-item-card:: PyGambit Python package
-      :columns: 6
+   .. grid-item-card:: 🐍 PyGambit
+      :columns: 4
 
-      Create games and compute equilibria with the PyGambit package.
+      Explore tutorial notebooks and API reference docs.
 
       .. button-ref:: pygambit
          :ref-type: ref
@@ -32,8 +33,8 @@ We recommended most new users install the PyGambit Python package and read the a
          :expand:
 
 
-   .. grid-item-card:: Command-line tools
-      :columns: 6
+   .. grid-item-card:: 🖥️ Command-line tools
+      :columns: 4
 
       Quickly compute equilibria with the Gambit command-line tools.
 
@@ -43,18 +44,39 @@ We recommended most new users install the PyGambit Python package and read the a
          :color: secondary
          :expand:
 
-   .. grid-item-card:: Graphical interface
-      :columns: 6
+   .. grid-item-card:: 🖱️ Graphical interface
+      :columns: 4
 
-      Gambit's graphical interface lets you interactively
-      create, explore, and find equilibria of games.
+      Interactively create, explore, and find equilibria of games.
 
       .. button-ref:: section-gui
          :ref-type: ref
          :click-parent:
          :color: secondary
          :expand:
 
+   .. grid-item-card:: 🐛 Bugs and feature requests
+      :columns: 4
+
+      Report bugs and feature requests on GitHub.
+
+      .. button-ref:: github-issues
+         :ref-type: ref
+         :click-parent:
+         :color: secondary
+         :expand:
+
+   .. grid-item-card:: 📖 Developer docs
+      :columns: 4
+
+      Guides for developers & contributors to the package.
+
+      .. button-ref:: developer
+         :ref-type: ref
+         :click-parent:
+         :color: secondary
+         :expand:
+
 
 .. toctree::
    :hidden: