[Accessibility] Remove and replace Search screenshots (github#36679)

Co-authored-by: Sophie <[email protected]>
Co-authored-by: Laura Coursen <[email protected]>

Author: 3 people

assets/images/help/search/advanced_search.png

@@ -68,6 +68,8 @@ You can search {% data variables.product.product_name %} using the {% data varia
 
 The {% data variables.search.advanced_url %} provides a visual interface for constructing search queries. You can filter your searches by a variety of factors, such as the number of stars or number of forks a repository has. As you fill in the advanced search fields, your query will automatically be constructed in the top search bar.
 
+![Screenshot of the Advanced search page. The top search bar is filled in with the query "kittens user:octocat" and, under the "Advanced options" section below, the "From these owners" text box contains the term "octocat" and is outlined in dark orange.](/assets/images/help/search/advanced_search.png)
+
 ## Searching repositories on {% data variables.product.prodname_dotcom_the_website %} from your private enterprise environment
 
 {% ifversion fpt or ghec %}

assets/images/help/search/find-file-button.png

@@ -13,9 +13,7 @@ versions:
 topics:
   - GitHub search
 ---
-Use the Sort menu to sort results by relevance, number of stars, number of forks, and how recently the items were updated.
-
-  ![Menu with options for sorting search results](/assets/images/help/search/repo-search-sort.png)
+Use the **Sort** dropdown menu to sort results by relevance, number of stars, number of forks, and how recently the items were updated.
 
 To sort by interactions, reactions, author date, committer date, or how recently the items were updated, you can add a `sort` qualifier to your search query.
 

assets/images/help/search/find-file-search-field.png

@@ -26,9 +26,9 @@ topics:
 
 {% data reusables.repositories.navigate-to-repo %}
 2. Above the list of files, click **Go to file**.
-![Find file button](/assets/images/help/search/find-file-button.png)
+![Screenshot of a row of buttons on the main page of a repository. The "Go to file" button is outlined in dark orange.](/assets/images/help/search/find-file-button.png)
 3. In the search field, type the name of the file you'd like to find.
-![Find file search field](/assets/images/help/search/find-file-search-field.png)
+![Screenshot of the search bar for finding a file in a repository. The search bar contains the term "readme" and under the search bar is a link to the file that is the result of the search, "README.md". The search bar is outlined in dark orange. ](/assets/images/help/search/find-file-search-field.png)
 4. In the list of results, click the file you wanted to find.
 
 {% ifversion file-finder-exclusion-controls %}