refactor(cookiePath): remove non-working cookiePath option

[pano9000]

Hi,

this PR basically reverts TriliumNext/Trilium#5473

After some further investigation I found out that this option will currently never work out of the box – and in my testing it only worked due to some special reverse-proxy config in combination I hadn't considered… 🙈 Sorry about that!

Under normal circumstances the cookie will never be set by the server, if you use a different path other than "/", because express never serves that path and hence the cookie is never set or even read.

In order for this to work we would need to introduce some kind of "custom route prefix", that would make express serve the routes with the custom prefix — but that kinda falls more into a reverse proxy job territory and IMHO probably out of scope for Trilium Server itself (correct me if I'm wrong though).

So let's remove this feature for now and amend the docs on how to correctly handle the cookies per instance via the reverse proxy.

For nginx e.g. the correct way to handle this is to set the proxy_cookie_path directive, that will rewrite the cookiePath for us and allow us to have different cookies per instance:

location /trilium/instanceA {
       proxy_pass   http://127.0.0.1:8080; // or whatever you use here

       proxy_cookie_path / /trilium/instanceA;
       …
}

location /trilium/instanceB {
       proxy_pass   http://127.0.0.1:8081; // or whatever you use here

       proxy_cookie_path / /trilium/instanceB;
       …
}

just need to figure out where in the Docs this info fits the best and I will amend them accordingly and set the PR to "Ready for review".

closes TriliumNext/Trilium#5632

[github-actions]

Folder/File	Previous size	New size	Difference
/upload/TriliumNextNotes-Server-1686-merge-linux-x64.tar.xz		82.73MB	+82.73MB (+100.00%)
TOTAL			+82.73MB

[github-actions]

Folder/File	Previous size	New size	Difference
/upload/TriliumNextNotes-1686-merge-linux-x64.deb		135.33MB	+135.33MB (+100.00%)
/upload/TriliumNextNotes-1686-merge-linux-x64.flatpak		128.09MB	+128.09MB (+100.00%)
/upload/TriliumNextNotes-1686-merge-linux-x64.rpm		143.2MB	+143.2MB (+100.00%)
/upload/TriliumNextNotes-1686-merge-linux-x64.zip		173.84MB	+173.84MB (+100.00%)
TOTAL			+580.47MB