refactor(save-modal): remove obsolete LocalStorageButton component

[hejtful]

obsolete code since we now save all changes periodically to localStorage using the url (or part of it) as id

[vercel]

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Name	Status	Preview	Updated (UTC)
frontend	✅ Ready (Inspect)	Visit Preview	Feb 6, 2025 1:12pm

[github-actions]

📦 Next.js Bundle Analysis for @serlo/frontend

This analysis was generated by the Next.js Bundle Analysis action. 🤖

Eighteen Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/biologie	175.04 KB (🟢 -38 B)	280.41 KB
/chemie	175.04 KB (🟢 -38 B)	280.41 KB
/entity/create/[type]/[taxonomyId]	223.08 KB (🟢 -189 B)	328.46 KB
/entity/repository/add-revision/[...id]	222.75 KB (🟢 -189 B)	328.13 KB
/event/history	124.64 KB (🟢 -38 B)	230.01 KB
/event/history/[...slug]	125.62 KB (🟢 -38 B)	230.99 KB
/event/history/user/profile/[username]	128 KB (🟢 -38 B)	233.38 KB
/informatik	175.04 KB (🟢 -38 B)	280.41 KB
/lerntipps	175.04 KB (🟢 -38 B)	280.41 KB
/mathe	175.03 KB (🟢 -38 B)	280.41 KB
/nachhaltigkeit	175.04 KB (🟢 -38 B)	280.42 KB
/page/create	222.75 KB (🟢 -188 B)	328.13 KB
/subscriptions/manage	107.59 KB (🟢 -38 B)	212.97 KB
/taxonomy/term/create/[parent_id]/[id]	222.46 KB (🟢 -189 B)	327.83 KB
/taxonomy/term/update/[id]	222.38 KB (🟢 -189 B)	327.75 KB
/user/notifications	126.87 KB (🟢 -38 B)	232.25 KB
/user/profile/[username]	193.48 KB (🟢 -38 B)	298.86 KB
/user/settings	224.54 KB (🟢 -189 B)	329.91 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

[elbotho]

Thank you.
One follow up: The feedback is not very helpful now, we should probably still inform the user that they can come back, restore the content and try saving again later.

[hejtful]

@elbotho Please feel free to change the message within this PR, or just leave the text as a comment and I'll change it.