Update regions documentation to reflect Fly.io region consolidation

Removed deprecated regions following https://fly.io/blog/the-region-consolidation-project/

Kept only the 18 consolidated regions:
- North America: dfw, ewr, iad, lax, ord, sjc, yyz
- Europe: ams, arn, bom, cdg, fra, lhr
- Asia-Pacific: nrt, sin, syd
- South America: gru
- Africa: jnb

Co-Authored-By: Alek <[email protected]>

Author: devin-ai-integration[bot]

docs/hosting/regions.md

@@ -9,38 +9,21 @@ from pcweb.styles.styles import get_code_style, cell_style
 regions = {
     "ams": "Amsterdam, Netherlands",
     "arn": "Stockholm, Sweden",
-    "atl": "Atlanta, Georgia (US)",
-    "bog": "Bogotá, Colombia",
     "bom": "Mumbai, India",
-    "bos": "Boston, Massachusetts (US)",
     "cdg": "Paris, France",
-    "den": "Denver, Colorado (US)",
     "dfw": "Dallas, Texas (US)",
     "ewr": "Secaucus, NJ (US)",
-    "eze": "Ezeiza, Argentina",
     "fra": "Frankfurt, Germany",
-    "gdl": "Guadalajara, Mexico",
-    "gig": "Rio de Janeiro, Brazil",
     "gru": "Sao Paulo, Brazil",
-    "hkg": "Hong Kong, Hong Kong",
     "iad": "Ashburn, Virginia (US)",
     "jnb": "Johannesburg, South Africa",
     "lax": "Los Angeles, California (US)",
     "lhr": "London, United Kingdom",
-    "mad": "Madrid, Spain",
-    "mia": "Miami, Florida (US)",
     "nrt": "Tokyo, Japan",
     "ord": "Chicago, Illinois (US)",
-    "otp": "Bucharest, Romania",
-    "phx": "Phoenix, Arizona (US)",
-    "qro": "Querétaro, Mexico",
-    "scl": "Santiago, Chile",
-    "sea": "Seattle, Washington (US)",
     "sin": "Singapore, Singapore",
     "sjc": "San Jose, California (US)",
     "syd": "Sydney, Australia",
-    "waw": "Warsaw, Poland",
-    "yul": "Montreal, Canada",
     "yyz": "Toronto, Canada"
 }