Merge and resolve differences between the two TTW files

Author: stevepiercy

docs/classic-ui/theming/through-the-web.md

@@ -1,21 +1,65 @@
-# TTW Customizations in Plone 6 Classic UI
+(classic-ui-through-the-web-label)=
 
-Small CSS changes via control panel in Plone 6 Classic UI's custom.css.
+# Through-the-web (TTW) Theme Customization in Plone 6 Classic UI
 
-* Logo change control panel
-* Favicon change via control panel
-* Custom CSS (controlpanel)
+TTW customization is useful when you need to make small CSS changes.
+Theme changes can be made via control panels or by updating Plone 6 Classic UI's `custom.css`.
+Other theming methods should be used for larger customizations or entire website designs.
 
-# Custom CSS
 
-Available via controlpanel
+(classic-ui-through-the-web-control-panels-label)=
 
-* Custom styles without compilation
-* Shipped as last resource after all other CSS files
-* Ovierride default CSS
+## Control Panels
+
+You can make the following changes through control panels.
+
+* Logo
+* Favicon
+* Custom CSS in `custom.css`
+
+With `custom.css`, you can make custom styles without compilation.
+It is shipped as the last resource after all other CSS files.
+It can be used to override default CSS, sometimes with the use of the CSS property `!important` or specific CSS selectors.
+
+
+```{todo}
+Provide usage.
+Provide navigation through {menuselection}`Site Setup --> Theming` or {guilabel}`Button Name`.
+Add screenshots.
+```
+
+
+(classic-ui-through-the-web-css-variables-label)=
 
 ## CSS Variables
 
-* CSS variables are available
-* Bootstrap's CSS variables are used
-* Use it to tweak colors, fonts, etc.
+Plone uses Twitter Bootstrap's CSS variables.
+They are used to tweak colors, fonts, spacing, and other CSS attributes.
+
+```{todo}
+Provide usage.
+```
+
+
+
+(classic-ui-through-the-web-theming-control-panel-label)=
+
+## Theming Control Panel
+
+The Theming control panel is limited to downloading and uploading themes.
+
+
+(classic-ui-through-the-web-templates-label)=
+
+### Templates
+
+
+(classic-ui-through-the-web-restricted-python-label)=
+
+### Restricted Python
+
+
+(classic-ui-through-the-web-content-types-label)=
+
+### Content Types
+