Improve the dark mode support

This reverts commit 8741e81
to add a better dark mode support using CSS.

Signed-off-by: Fujimoto Seiji <fujimoto@ceptord.net>

Author: fujimotos

source/_static/custom.css

@@ -21,3 +21,15 @@ table.table-of-contents td  p {
     color: #343434;
     margin-bottom: 0.3em;
 }
+
+html[data-theme="dark"] .logo img {
+    filter: invert(100%) sepia(98%) saturate(0%) hue-rotate(307deg) brightness(104%) contrast(104%);
+}
+
+html[data-theme="dark"] h1,
+html[data-theme="dark"] h2,
+html[data-theme="dark"] h3,
+html[data-theme="dark"] h4,
+html[data-theme="dark"] h5 {
+    color: #aaa;
+}

source/_static/logo-dark.png

@@ -53,6 +53,7 @@
 #
 html_theme = 'pydata_sphinx_theme'
 html_title = 'FlexConfirmMail'
+html_logo = '_static/logo.svg'
 html_baseurl = 'https://www.flexconfirmmail.com/'
 html_css_files = ['custom.css']
 html_show_copyright = False
@@ -78,10 +79,6 @@
    "use_edit_page_button": True,
    "navigation_with_keys": False,
    "show_prev_next": False,
-   "logo": {
-      "image_light": "logo.svg",
-      "image_dark": "logo-dark.png",
-   }
 }