Add better help text

Author: skalahonza

Components/Pages/Home.razor

@@ -62,8 +62,12 @@
                               Variant="Variant.Outlined"
                               Adornment="Adornment.End"
                               AdornmentIcon="@Icons.Material.Filled.Search"
-                              HelperText="Search by typing repository names or keywords"
-                              MaxLength="1000"/>
+                              MaxLength="100"/>
+                <MudText Typo="Typo.caption">
+                    Search by typing repository names or keywords.
+                    Results will appear instantly as you type.
+                    Use the minus (-) operator in front of a word or phrase to exclude it from search results.
+                </MudText>
             </MudStack>
         </MudPaper>
     </MudItem>