Add Docker restart policy to deployment guides

[kmcginnes]

Description

• Add --restart unless-stopped to the docker run commands in the EC2 deployment guide and the getting-started Local Docker Setup. Without a restart policy, the Graph Explorer container won't come back up after a host reboot or crash — important for EC2, EKS, and long-running local deployments.
• Add a tip in the EC2 guide linking to Docker's restart policy documentation for users who want different behavior.

Validation

Verified --restart unless-stopped is the recommended Docker restart policy for containers that should survive host reboots but respect manual stops.

Related Issues

• Fixes Add guidance about Docker restart policy #1169

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have verified pnpm checks passes with no errors.
• I have verified pnpm test passes with no failures.
• I have covered new added functionality with unit tests if necessary.
• I have updated documentation if necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.69%. Comparing base (c5affc5) to head (dc4ce34).
⚠️ Report is 152 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1711       +/-   ##
===========================================
+ Coverage   47.81%   72.69%   +24.88%     
===========================================
  Files         382      408       +26     
  Lines        8525    12287     +3762     
  Branches     3159     3529      +370     
===========================================
+ Hits         4076     8932     +4856     
+ Misses       3070     2337      -733     
+ Partials     1379     1018      -361     

Flag	Coverage Δ
unittests	72.69% <ø> (+24.88%)	⬆️

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