Update Blogs and introduce v5

[spipau]

• Update Blogs server PHP
• Publish blogs PHP on webpace
• Introduce v5 and add it in the code
• Fix many broken links
• Fix wrong colour in detail screen

refs #212

[spipau]

@jobguitiche Today I was so motivated after our call that I also updated a few things :wink: Please review and let me know what you think :+1: