Update Tips & Tricks page

[justbispo]

I'd make these changes myself but I want to make sure these are agreed by the team.

1. Since Vesktop uses Electron 39, it should now flip the content of "Wayland support" to X11. Mention that --ozone-platform=x11 should be added if the user wants to force Vesktop in XWayland (not needed for an X window manager, Electron should detect it automatically)

2. The "Making Command Line Flags Permanent" section should mention that, with the AUR packages mentioned in the Linux installation page, the flags should be added to $XDG_CONFIG_HOME/vesktop-flags.conf. Adding the flags to the .desktop file isn't the best solution since on upgrade, the AUR package managers will replace the edited file.

[Vendicated]

1. Yes
2. I don't like documenting that because this is not official and not applicable to any other Vesktop packages. I also don't want to suggest people to copy the .desktop file to ~/.local/share/applications because we may change it with updates and this way users will not get new features. Vesktop updates are rare so it's fine to just re-add flags after updates imo