Fix typos, unused code, and error handling in storage operations

[Copilot]

Atomic commits for low-hanging fruit improvements:

• Fix typos
  • .gitignore: __pychache__ → __pycache__
  • README.md: Fix clone URL (ip-trigger.py → ip-trigger.git)
  • railgun_backend.py: becuase → because
• Remove unused variables
  • cloudflare_backend.py: Remove unused URL variable
• Use context manager for file handling
  • ip-trigger.py: Use with statement in store_ip()
• Add error handling for missing storage file
  • ip-trigger.py: Catch CalledProcessError in retrieve_last_ip_from_storage()
• Add error handling for empty storage file
  • ip-trigger.py: Check for empty string after reading storage file

Original prompt

Identify low hanging fruit improvements

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[vekerdyb]

@copilot Well, let's discard that, and start again.

From the start make small, atomic commits. First fix typos. Then remove unused variables. Then add error handling, one per commit.

[Copilot]

@copilot Well, let's discard that, and start again.

From the start make small, atomic commits. First fix typos. Then remove unused variables. Then add error handling, one per commit.

Done! I've restructured the changes into small, atomic commits:

1. 9c0e19d - Fix typos (.gitignore, README.md, railgun_backend.py)
2. 0406520 - Remove unused URL variable (cloudflare_backend.py)
3. 2a1cf02 - Use context manager for file handling (ip-trigger.py)
4. 046e721 - Add error handling for missing storage file (ip-trigger.py)
5. 2634ff3 - Add error handling for empty storage file (ip-trigger.py)

Each commit now contains one logical change.