[enh] add engine PyPi (XPath)

Add a XPath configuration for PyPI (Python Package Index)

Slightly modified merge of [66d06b05] from searx's [PR 2830].

[PR 2830] https://github.com/searx/searx/pull/2830
[66d06b05] https://github.com/searx/searx/pull/2830/commits/66d06b05

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -860,6 +860,26 @@ engines:
     categories: science
     timeout : 3.0
 
+  - name: pypi
+    shortcut: pypi
+    engine: xpath
+    paging: true
+    search_url : https://pypi.org/search?q={query}&page={pageno}
+    results_xpath: /html/body/main/div/div/div/form/div/ul/li/a[@class="package-snippet"]
+    url_xpath: ./@href
+    title_xpath: ./h3/span[@class="package-snippet__name"]
+    content_xpath: ./p
+    suggestion_xpath: /html/body/main/div/div/div/form/div/div[@class="callout-block"]/p/span/a[@class="link"]
+    first_page_num: 1
+    categories: it
+    about:
+      website: https://pypi.org
+      wikidata_id: Q2984686
+      official_api_documentation: https://warehouse.readthedocs.io/api-reference/index.html
+      use_official_api: false
+      require_api_key: false
+      results: HTML
+
   - name : qwant
     engine : qwant
     shortcut : qw