docs: fix typo and update preview support

Author: CyanVoxel

docs/index.md

@@ -92,7 +92,7 @@ hide:
 
     ***
 
-    Apposed to filling your drives with [sidecar files](https://en.wikipedia.org/wiki/Sidecar_file), TagStudio uses a project-like [library](libraries.md) system that stores your tags and metadata inside a single save file per-library.
+    Opposed to filling your drives with [sidecar files](https://en.wikipedia.org/wiki/Sidecar_file), TagStudio uses a project-like [library](libraries.md) system that stores your tags and metadata inside a single save file per-library.
 
     [:material-arrow-right: Learn About the Format](libraries.md)
 

docs/preview-support.md

@@ -95,10 +95,10 @@ Preview support for office documents or well-known project file formats varies b
 
 ### :material-book: eBooks
 
-| Filetype           | Extensions            | Preview Type                 |
-| ------------------ | --------------------- | ---------------------------- |
-| EPUB               | `.epub`               | Embedded cover               |
-| Comic Book Archive | `.cbr`, `.cbt` `.cbz` | Embedded cover or first page |
+| Filetype           | Extensions                    | Preview Type                 |
+| ------------------ | ----------------------------- | ---------------------------- |
+| EPUB               | `.epub`                       | Embedded cover               |
+| Comic Book Archive | `.cbr`, `.cbt` `.cbz`, `.cb7` | Embedded cover or first page |
 
 ### :material-cube-outline: 3D Models