Feat: new tag specific feed page, updates to routing data fetching

[MTG2000]

• Added a specific page for each official Tag feed
• Unify the tag's formatting
• Remove the "Following" button from the feed
• Update to the latest React-Router version. The new version introduced a new data fetching patterns that could allow for a better pre-fetching & loading spinners experience. I currently only updated the Post Details Page to use it. The result is that we are able now to get rid of the page skeleton & instead keep showing the original page with a global progress bar until the post details api data load.

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