format md files

- use doublequote in yaml
- right indentation in yaml
- format missformatted places

site/src/docs/backup/url-migration/index.md

@@ -12,21 +12,22 @@ First you have to create a `rules` file in remark's `/var` folder.
 
 Format is simply `old_url new_url` like following:
 
- ```
- https://example.org/old-url-1/ https://example.org/new-url-1/
- https://example.org/old-url-2/ https://example.org/new-url-2/
- ```
+```
+https://example.org/old-url-1/ https://example.org/new-url-1/
+https://example.org/old-url-2/ https://example.org/new-url-2/
+```
 
 ### Applying the remap
 
 After rules file is ready, run the following command:
 
- ```shell
- remark42 remap --admin-passwd <password> -f var/rules
- ```
+```shell
+remark42 remap --admin-passwd <password> -f var/rules
+```
 
 If running in a docker container, the command becomes:
- ```shell
- docker ps # to find the container name
- docker exec -it <container> remark42 remap --admin-passwd <password> -f var/rules
- ```
+
+```shell
+docker ps # to find the container name
+docker exec -it <container> remark42 remap --admin-passwd <password> -f var/rules
+```