docs: Added fix for building on Windows and resolved other build errors (#2395)

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# Description
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@eukleshnin identified issues with building the documents locally on a
Windows workstation. Namely, the following was occurring:

```
reading sources... [  2%] flame/layout/align_component
Exception occurred:

FileNotFoundError: [WinError 2]
```
This was determined to be a combination of several things.

1. In `dart_domain.py`, the `subprocess.run` calling dartdoc_json did
not have the shell parameter set to true. This solves the error about
the file not being found. This then generates errors that subsequent
references to the `temp_file` did not exist.
2. This was due to the default setting with Python `tempfile` where when
it determines the temp file has been closed, it deletes it; however, it
was still needed, so by setting the `delete=False` parameter, the file
would still remain.
3. Unfortunately, because it still remains, it needs to be deleted once
it is no longer needed. Trying to use `finally:` with the `try` block
failed to produce the results desired, so the temp file name was
registered with the class so it can be deleted in the original calling
function if it exists. This proved successful.
4. Although not critical, the same temp file uses a suffix of `json` so
it was creating files `xxxxjson`. By adding the "." in the suffix, it
creates valid file names now. This doesn't actually fix anything, it
just seemed wrong, so I fixed it to be valid files if ever needed down
the road.

Now that the docs built, there were several warnings that could be
resolved:
1. `Overlays.md` was not referenced in the TOC tree.
2. Since overlays were removed in
https://github.com/flame-engine/flame/pull/2384, the Platformer tutorial
had a link to the old path and it needed to be updated.

Finally and open for discussion, during this process of debugging, I
upgraded all packages to the most current to see what impacts there
were. The following is the old and new potential `requirements.txt`:

```
----Old
linkify-it-py==2.0.0
myst-parser==0.18.1
Pygments==2.12.0
Sphinx==5.0.2
sphinxcontrib-mermaid==0.8.1
sphinx-autobuild==2021.3.14
jinja2==3.1.2

----- New
linkify-it-py==2.0.0
myst-parser==1.0.0
Pygments==2.14.0
Sphinx==6.1.3
sphinxcontrib-mermaid==0.8.1
sphinx-autobuild==2021.3.14
Jinja2==3.1.2
```

The only byproduct of this upgrade was a deprecated package warning for
`attrs_image` in `conf.py` which was updated to `attrs_inline`. I made
that change initially for this PR, but backed it out as I didn't know if
there was a desire to update the `requirements.txt` and felt some
discussion may be warranted.

Regardless, with everything upgraded or left as is, the other fixes
resolve the issues on Windows.

## Checklist
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- [X] I have followed the [Contributor Guide] when preparing my PR.
- [ ] I have updated/added tests for ALL new/updated/fixed
functionality.
- [X] I have updated/added relevant documentation in `docs` and added
dartdoc comments with `///`.
- [ ] I have updated/added relevant examples in `examples` or `docs`.


## Breaking Change?
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- [ ] Yes, this PR is a breaking change.
- [X] No, this PR is not a breaking change.


## Related Issues
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---------

Co-authored-by: Lukas Klingsbo <me@lukas.fyi>

doc/_sphinx/extensions/dart_domain.py

@@ -167,15 +167,18 @@ class DartdocDirective(SphinxDirective):
         self.record['timestamp'] = source_last_modified_time
 
     def _scan_source_file(self):
-        with tempfile.NamedTemporaryFile(mode='rt', suffix='json') as temp_file:
+        with tempfile.NamedTemporaryFile(mode='rt', suffix='.json', delete=False) as temp_file:
             try:
+                temp_file.close()
                 subprocess.run(
                     ['dartdoc_json', self.source_file, '--output', temp_file.name],
                     stdout=subprocess.PIPE,
                     stderr=subprocess.STDOUT,
                     check=True,
+                    shell=True,
                 )
-                json_string = temp_file.read()
+                with open(temp_file.name, 'r') as t:
+                    json_string = t.read()
                 return self._extract_symbol(json_string)
             except subprocess.CalledProcessError as e:
                 cmd = ' '.join(e.cmd)
@@ -183,6 +186,8 @@ class DartdocDirective(SphinxDirective):
                     f'Command `{cmd}` returned with exit status'
                     f' {e.returncode}\n{e.output.decode("utf-8")}'
                 )
+            finally:
+                os.remove(temp_file.name)
 
     def _extract_symbol(self, json_string: str) -> Dict:
         """