fix markdown formatting

README.md

@@ -588,7 +588,8 @@ Each snapshot subfolder `./archive/<timestamp>/` includes a static `index.json`
 
 You can export the main index to browse it statically without needing to run a server.
 
-*Note about large exports: These exports are not paginated, exporting many URLs or the entire archive at once may be slow. Use the filtering CLI flags on the `archivebox list` command to export specific Snapshots or ranges.*
+> **Note**
+> These exports are not paginated, exporting many URLs or the entire archive at once may be slow. Use the filtering CLI flags on the `archivebox list` command to export specific Snapshots or ranges.
 
 ```bash
 # archivebox list --help
@@ -985,6 +986,7 @@ archivebox init --setup
 <details><summary><i>Click to expand...</i></summary>
 
 Make sure to run this whenever you change things in `models.py`.
+
 ```bash
 cd archivebox/
 ./manage.py makemigrations
@@ -993,6 +995,7 @@ cd path/to/test/data/
 archivebox shell
 archivebox manage dbshell
 ```
+
 (uses `pytest -s`)  
 https://stackoverflow.com/questions/1074212/how-can-i-see-the-raw-sql-queries-django-is-running
 
@@ -1000,7 +1003,9 @@ https://stackoverflow.com/questions/1074212/how-can-i-see-the-raw-sql-queries-dj
 
 #### Contributing a new extractor
 
-<details><summary><i>Click to expand...</i></summary><br/><br/>
+<details><summary><i>Click to expand...</i></summary>
+
+<br/><br/>
 
 ArchiveBox [`extractors`](https://github.com/ArchiveBox/ArchiveBox/blob/dev/archivebox/extractors/media.py) are external binaries or Python/Node scripts that ArchiveBox runs to archive content on a page.