Optimize search results

[allevo]

In this PR:

• the orama schema changed into

{
  "path": "string",
  "title": "string",
  "content": "string",
  "section": "string",
  "category": "enum",
  "parent_H1": {
    "content": "string",
    "section": "string"
  },
  "parent_H2": {
    "content": "string",
    "section": "string"
  }
}

• every document also contains the "parent" context (ie, title and content)
• the search uses the boost parameter