Update deploy fabfile for RHEL8 (#91)

This command updates the repo fabfile.py for deploys to RHEL8, from the
previous RHEL7 configuration. The only change has to do with the
location of the crawl database file itself, moving it from /var/tmp
to the deploy location in /opt/cfpb/website-indexer. This change is
necesssary due to the different volume configuration in our RHEL8 AMI.

README.md

@@ -239,7 +239,7 @@ _For information on how this project is deployed at the CFPB,
 employees and contractors should refer to the internal "CFGOV/crawler-deploy" repository._
 
 This repository includes a [Fabric](https://www.fabfile.org/) script
-that can be used to configure a RHEL7 Linux server to run this project
+that can be used to configure a RHEL8 Linux server to run this project
 and to deploy both the crawler and the viewer application to that server.
 
 To install Fabric in your virtual environment:
@@ -250,7 +250,7 @@ pip install -r requirements/deploy.txt
 
 ### Configuring a server
 
-To configure a remote RHEL7 server with the appropriate system requirements,
+To configure a remote RHEL8 server with the appropriate system requirements,
 you'll need to use some variation of this command:
 
 ```

fabfile.py

@@ -26,7 +26,7 @@
 SOURCE_ROOT = f"{SOURCE_PARENT}/{SOURCE_DIRNAME}"
 
 CRAWL_DIR = "/var/tmp"
-CRAWL_DATABASE = f"{CRAWL_DIR}/crawl.sqlite3"
+CRAWL_DATABASE = f"{SOURCE_ROOT}/crawl.sqlite3"
 CRAWL_DATABASE_TMP = f"{CRAWL_DIR}/crawl-new.sqlite3"
 
 LOGROTATE_DIR = "/etc/logrotate.d"