Move bridge post-install info to "Technical Setup"

The relay post-install info is located at /relay/setup/post-install/, but the bridge post-install info is mixed in between the operating systems at /relay/setup/bridge/post-install/.

I suggest moving the bridge post-install page next to the relay post-install page at /relay/setup/.

What needs to be done:

Move /relay/setup/post-install/ to /relay/setup/relay-post-install/
Move /relay/setup/bridge/post-install/ to /relay/setup/bridge-post-install/
Update all links to the new destination of /relay/setup/post-install/
Update all links to the new destination of /relay/setup/bridge/post-install/
Change the title of /relay/setup/bridge-post-install/contents.lr to "Bridge Post-install"
Change the key of /relay/setup/bridge-post-install/contents.lr to "4"
Change the key of /relay/setup/post-install/contents.lr from "4" to "5"
Change the key of /relay/setup/snowflake/contents.lr from "5" to "6"

I could work on this.