Make the murfey client config file optional

[stephen-riggs]

The /home/.murfey file should no longer be needed, as it only records the server and instrument names.
This PR removes the need for this file.

• Adds a --server flag on instrument server startup to supply the backend url.
• The need for the instrument name has been removed entirely.

If the --server flag is not provided we fall back to the config file.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.33%. Comparing base (b9108c9) to head (afea0a7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #768      +/-   ##
==========================================
+ Coverage   49.31%   49.33%   +0.02%     
==========================================
  Files          92       92              
  Lines        9815     9826      +11     
  Branches     1296     1298       +2     
==========================================
+ Hits         4840     4848       +8     
- Misses       4725     4726       +1     
- Partials      250      252       +2     

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[tieneupin]

Thanks for sorting this out, Stephen. The PR looks good to me.