Refactor navbar and restructure VPS/Dedicated Server content

[fgalz]

Overhauled the navbar with an improved design and extended functionality, including better navigation structure and multilingual support. As part of this effort, the VPS and Dedicated Server documentation has been restructured to eliminate duplicate content.

Previously, many guides existed as both vserver-* and dedicated-* variants with nearly identical content. The worse-performing variant has been removed in each cas, with 301 redirects pointing from the deleted pages to their better-ranked version.

The remaining guides have been updated to be fitting for both versions. Titles no longer carry a "VPS" or "Dedicated Server" prefix, descriptions use generic "server" terminology and the body content references "VPS/Dedicated Server" where applicable. Service metadata has been updated so these guides appear under both product categories.

[Blumlaut]

please put content and code changes into seperate PRs in the future, this is impossible to even get close to reviewing, malicious or buggy changes have no chance of being detected with diffs like this.

[fgalz]

please put content and code changes into seperate PRs in the future, this is impossible to even get close to reviewing, malicious or buggy changes have no chance of being detected with diffs like this.

Although I agree with you in general that this is not the optimal way/solution, considering that a major restructuring is currently underway and I need to implement this in a way that allows Docs to continue building, this is the significantly simpler and more time-efficient approach than first implementing everything and then restructuring it all. That would mean duplicating the work for the navigation bar and sidebar.