Update laboratory references from NREL to NLR in documentation

[Copilot]

Rebrand laboratory name from "National Renewable Energy Laboratory (NREL)" to "National Laboratory of the Rockies (formerly known as NREL)" with abbreviation "NLR".

Changes

• README.md: Updated laboratory name and abbreviation in license section
• docs/src/index.md: Updated laboratory name in About Sienna section

Preservation

• GitHub organization NREL-Sienna unchanged
• All URLs containing nrel unchanged (github.com/NREL-Sienna/, nrel-sienna.github.io, www.nrel.gov)
• Repository paths and Slack links preserved

Original prompt

Objective

Update references to "NREL" and "National Renewable Energy Laboratory" to "NLR" and "National Laboratory of the Rockies (formerly known as NREL)" in the README and documentation files.

Requirements

1. Replace the following text patterns:

   • "National Renewable Energy Laboratory" → "National Laboratory of the Rockies (formerly known as NREL)"
   • "NREL" → "NLR" (only in text references, NOT in URLs or GitHub organization names)

2. Files to update:

   • README.md (line 30)
   • docs/src/index.md (line 27)

3. Critical: DO NOT change:

   • Any GitHub organization references (e.g., "NREL-Sienna")
   • Any URLs containing "nrel" (e.g., https://www.nrel.gov/, https://github.com/NREL-Sienna/, nrel-sienna.github.io)
   • Any GitHub repository paths or links
   • The Slack link (nrel-sienna)
   • Any references in CONTRIBUTING.md that point to GitHub URLs
   • Any references in Artifacts.toml pointing to GitHub URLs

Specific Changes

README.md

Current text (line 28-30):

PowerSystems is released under a BSD [license](https://github.com/NREL/PowerSystems.jl/blob/main/LICENSE).
PowerSystems has been developed as part of the Scalable Integrated Infrastructure Planning (SIIP)
initiative at the U.S. Department of Energy's National Renewable Energy Laboratory ([NREL](https://www.nrel.gov/)) Software Record SWR-23-105.

Should become:

PowerSystems is released under a BSD [license](https://github.com/NREL/PowerSystems.jl/blob/main/LICENSE).
PowerSystems has been developed as part of the Scalable Integrated Infrastructure Planning (SIIP)
initiative at the U.S. Department of Energy's National Laboratory of the Rockies (formerly known as NREL) ([NLR](https://www.nrel.gov/)) Software Record SWR-23-105.

docs/src/index.md

Current text (line 27):

`PowerSystemCaseBuilder.jl` is part of the National Renewable Energy Laboratory's

Should become:

`PowerSystemCaseBuilder.jl` is part of the National Laboratory of the Rockies (formerly known as NREL)'s

Validation

After making changes, verify that:

• All GitHub organization references remain "NREL-Sienna"
• All URLs remain unchanged (including https://github.com/NREL-Sienna/)
• Only the text references to the laboratory name and abbreviation are updated
• No broken links are introduced
• Comments and code in .jl files containing GitHub URLs to NREL-Sienna remain unchanged

This pull request was created from Copilot chat.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.66%. Comparing base (c4e6509) to head (b105605).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
- Coverage   92.67%   92.66%   -0.01%     
==========================================
  Files          18       18              
  Lines        4475     4474       -1     
==========================================
- Hits         4147     4146       -1     
  Misses        328      328              

Flag	Coverage Δ
unittests	92.66% <ø> (-0.01%)	⬇️

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see 1 file with indirect coverage changes

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