Fix anchor link positions in Chrome

[MarcelGeo]

Fixes #656

• here is a issue in chromium browsers where image height is not calculated properly (probably this is related: https://issues.chromium.org/issues/40753240)
• anchor links were not placed properly on pages with images (fresh open)

Solution

After some discussion with @brc-dd in vitepress issues (see: vuejs/vitepress#5079), following improvements were implemented:

• added markdown plugin to calculate width and height for each image from content
• added improvement to lite-youtube component using css to proper scrolling
• Precalulate images height and width with maxHeight = 500px to every image in markdown