Remove redundant help text, table columns and parameters from the Web UI (#898)

- Remove the Size option from the Drives page, since we offer custom sizes with Drive profiles now in the Create Image form
- Fetch size from drive props data structure rather than the web form
- Remove a range of redundant / obvious help text to reduce UI clutter and emphasize the important help text
- Remove the Size column from the CD-ROM drives table since it's always N/A
- Merge the two Logging related sections, and the two Create Image related sections (semantically associated)

python/web/src/web_utils.py

@@ -217,6 +217,7 @@ def get_properties_by_drive_name(drives, drive_name):
         "product": drive_props["product"],
         "revision": drive_props["revision"],
         "block_size": drive_props["block_size"],
+        "size": drive_props["size"],
         }
 
 def auth_active(group):