Refactor SCSS styles in common and about templates

- Removed unused styles and nested selectors from _common.scss to streamline the code.
- Cleaned up the .about section in _about.scss by eliminating redundant styles for headings and paragraphs.
- Improved overall readability and maintainability of the SCSS files.

themes/airspace-hugo/assets/scss/templates/_about.scss

@@ -1,26 +1,5 @@
 .about{
-  .block{
-    h2 {
-      padding-top: 30px;
-      padding-bottom: 30px;
-      margin:0;
-    }
-    
-    h3 {
-      padding-top: 30px;
-      padding-bottom: 30px;
-      margin:0;
-    }
 
-    p {
-      padding-top: 0px;
-      line-height:28px;
-    }
-
-    img {
-      width: 100%;
-    }
-  }
 
   .about-img {
     overflow:hidden;
@@ -35,7 +14,4 @@
     }
   }
 
-  .section-title {
-    margin-bottom: 0px;
-  }
 }