Some tweaks to the new Sphinx theme

Author: apdavison

doc/_static/custom.css

@@ -0,0 +1,32 @@
+#content ul:not(.search) {
+    list-style-type: disc;
+    margin-left: 1.5rem;
+    margin-top: 0.8rem;
+}
+
+#content ul:not(.search) p,
+#content ul:not(.search)>li {
+    margin-top: 0.8rem
+}
+
+#content section>p {
+    line-height: 1.75rem;
+    margin-top: 0.8rem
+}
+
+.contents,
+.toctree-wrapper {
+    font-size: 1rem;
+    line-height: 1.25rem
+}
+
+.contents ul li a.reference,
+.toctree-wrapper ul li a.reference {
+    color: hsl(var(--foreground)) !important;
+    display: inline-block;
+    font-weight: 600 !important;
+    text-decoration-line: none !important;
+    transition-duration: .15s;
+    transition-property: color, background-color, border-color, text-decoration-color, fill, stroke;
+    transition-timing-function: cubic-bezier(.4, 0, .2, 1)
+}

doc/conf.py

@@ -150,6 +150,8 @@ class MockNESTModule(mock.Mock):
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
+html_css_files = ["custom.css"]
+
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
 #html_last_updated_fmt = '%b %d, %Y'
@@ -194,6 +196,7 @@ class MockNESTModule(mock.Mock):
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'PyNNdoc'
 
+html_permalinks_icon = "<span>¶</span>"
 
 # -- Options for LaTeX output --------------------------------------------------