Rewrite all MDN CSS filter-function sub pages #231

Problem statement

Rewrite all the filter-function sub pages. They are all based on SVG filters.

Task list

• Add see also to all the sub pages (https://github.com/mdn/content/pull/24234/files)
• filter-function
• blur()
• brightness() Filter function: brightness() mdn/content#25057
• contrast() - CSS filter function: contrast() mdn/content#24990
• drop-shadow()
• grayscale()
• hue-rotate() - hue-rotate() filter function. Add SVG back in. mdn/content#24968
• invert()
• opacity()
• saturate()
• sepia()

Priority assessment

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