Add .idea to Git ignore

[arkadiuszbachorski]

Add .idea to Git ignore

♻️ Current situation & Problem

.idea is directory that stores per-project configuration of JetBrains IDEs. It shouldn't be versioned.

⚙️ Release Notes

• Add .idea to Git ignore

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[PSchmiedmayer]

Thank you @arkadiuszbachorski! 🚀

[PSchmiedmayer]

@arkadiuszbachorski I have fixed the eslint issues by updating our reusable GitHub Action to handle the state when we run the PRs from a fork, they all pass in the other PRs. Unfortunately re-running the GitHub Action here remembers the old version tag it used in the initial run (makes sense to make that reproducible) and therefore doesn't pick up the new change.

In addition @codecov seems to have run into an issue where they reached their GitHub rate limit: https://github.com/StanfordBDHG/NextJSTemplate/actions/runs/9289714498/job/25574778071?pr=17#step:6:34.

As we can't share a secret with a forked repo and they seem to struggle with that for a while I could see two options:

1. Create the PRs (or merge them in one PR in this repo by creating a branch)
2. I merge the PRs with my admin permissions.

I will go for (2) for now and will merge them in a sequential order.