feat(docs): add titles and slugs to various documentation files

[skeptrunedev]

find ./fern -type f -exec sh -c 'read line < "$1"; [ "$line" != "---" ] && echo "$1"' sh {} \; | grep -v images | grep -v changelog | grep -v .yml | grep -v .css | grep -v .js | grep -v snippets

Above command was used to find the pages which were missing the frontmatter.