Fix broken nav entry, tutorial links, and anchor in docs

Author: AndrewSazonov

docs/docs/user-guide/analysis-workflow/experiment.md

@@ -86,7 +86,7 @@ manually, you can use the `add_from_data_path` method of the
 need to specify the **name** of the experiment, which will be used to
 reference it later, as well as **data_path** to the measured data file
 (e.g., `.xye`, `.xy`). Supported formats are described in the
-[Measured Data Category](#5-measured-data-category) section.
+[Measured Data Category](#measured-data-category) section.
 
 Optionally, you can also specify the additional parameters that define
 the **type of experiment** you want to create. If you do not specify any

docs/docs/user-guide/first-steps.md

@@ -32,7 +32,7 @@ project = ed.Project()
 ```
 
 A complete tutorial using the `import` syntax can be found
-[here](../../tutorials/ed-3/).
+[here](../tutorials/ed-3.ipynb).
 
 ### Importing specific parts
 
@@ -57,7 +57,7 @@ project = Project()
 ```
 
 A complete tutorial using the `from` syntax can be found
-[here](../../tutorials/ed-4/).
+[here](../tutorials/ed-4.ipynb).
 
 ## Utility functions
 

docs/mkdocs.yml

@@ -222,7 +222,6 @@ nav:
           - experiment: api-reference/datablocks/experiment.md
           - structure: api-reference/datablocks/structure.md
       - display: api-reference/display.md
-      - experiments: api-reference/experiment.md
       - io: api-reference/io.md
       - project: api-reference/project.md
       - summary: api-reference/summary.md