Rename variables

[bidoubiwa]

fix: #32

• [x] Rename occurrences of docsearch with one s to docssearch with two s: Both are used in the code based, with two s's is the correct one
• [ ] rename urls_tags to path_segments. It is more accurate on what it contains
• [x] rename meilisearch_index_uid to meilisearch_index_uid
• [x] rename origin_index_name to initial_index_uid (all index_name to index_uid)
• [x] rename meilisearch_host to meilisearch_url
• [x] rename crawled_urls to start_urls ⚠️ ensure it makes sense.
• [x] rename custom_settings to meilisearch_settings
• [x] rename exclude_crawled_urls to exclude_urls
• [x] rename indexed_urls to urls_to_index
• [x] rename exclude_indexed_urls same as above
• [x] rename schema to schema_settings