Fix help command alignment

Intuitive rename of base.md to help.md to follow the pattern where
meza commands have a .md file by the same name.

meza                   # Shows help.md (general help)
meza --help            # Shows help.md (general help)
meza help              # Shows help.md (general help)
meza help deploy       # Shows deploy.md (deploy command help)
meza help --help       # Shows help.md (help for help command itself)
meza deploy --help     # Shows deploy.md (deploy command help)

Fixes Issue #211

Author: freephile

manual/meza-cmd/MIGRATION.md

@@ -62,7 +62,7 @@ def display_docs(name):
 All Meza commands now have comprehensive Markdown documentation:
 
 - [`backup.md`](backup.md) - Environment backup operations
-- [`base.md`](base.md) - Main Meza overview and command reference
+- [`help.md`](help.md) - Main Meza overview and command reference
 - [`config.md`](config.md) - Configuration management
 - [`create.md`](create.md) - Wiki creation commands
 - [`debug.md`](debug.md) - Debug and troubleshooting

manual/meza-cmd/base.md renamed to manual/meza-cmd/help.md

@@ -121,10 +121,10 @@ def main(argv):
     # meza requires a command parameter. No first param, no command. Display
     # help. Also display help if explicitly specifying help.
     if not argv:
-        display_docs('base')
+        display_docs('help')
         sys.exit(1)
     elif argv[0] in ('-h', '--help'):
-        display_docs('base')
+        display_docs('help')
         sys.exit(0)  # asking for help doesn't give error code
     elif argv[0] in ('-v', '--version'):
         version = subprocess.check_output(
@@ -2212,7 +2212,7 @@ def meza_command_help(argv):
         argv (list): Command line arguments
     """
     if len(argv) < 1:
-        display_docs('base')
+        display_docs('help')
         return
 
     command = argv[0]