docs/package.json should be .gitignored

[Jane Sandberg]

Just a small annoyance. This file shows up when I build the documentation locally, and `git status` reports it as an untracked file. Ideally, this should be in our .gitignore file, so we don't have to think about it when running `git status`.

Steps to recreate:

1. cd docs
2. perl generate_docs.pl --base-url="http://example.com"
3. git status
4. Note that package.json appears under "Untracked files"

Patch coming up soon.

[Jane Sandberg (sandbergja)]

Here is a branch: user/sandbergja/lp2035383-docs-package-gitignore

Here is the link: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sandbergja/lp2035383-docs-package-gitignore

Here are the testing notes from the commit:

1. cd docs
2. perl generate_docs.pl --base-url="http://example.com"
3. git status
4. Note that there is a bit less clutter, since package.json no longer appears under "Untracked files"

[Galen Charlton (gmc)]

Straightforward! Pushed to main and rel_3_11. Thanks, Jane.