Toshaan Bharvani 602628c969 event updates
* event list is now as discussed
    - call to action buttons
    - no text, just the title
    - date and place
    - cfp is red to highlight
* frontmatter sanatization
* use of shortcodes in place of conditional code

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>
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_index.md add Board of directors, Events, default single, Governance pages
fosdem21.md event updates
fosdem22.md event updates
openpowersummit21.md event updates
openpowersummit22.md event updates
openpowersummit23.md opfsummit23 change to draft