Develop: updated dependencies and docs (#7)

* chore: update dependencies
https://github.com/jupyter/nbconvert/releases/tag/7.0.0rc0

* docs: add details on manual deploy to heroku

README.md

@@ -106,6 +106,23 @@ Sleeps: yes
 
 [Enabled Autodeploy from Github](https://devcenter.heroku.com/articles/github-integration)
 
+[Manual deploy to Heroku](https://devcenter.heroku.com/articles/git#deploy-your-code)
+
+From main branch:
+```shell
+heroku login
+
+git push heroku main
+```
+
+From branch beside main:
+
+```shell
+heroku login
+
+git push heroku branch_name:main
+```
+
 # Roadmap
 
 To view/submit ideas as well as contribute please view issues.

poetry.lock

@@ -662,7 +662,7 @@ test = ["ipython", "ipykernel", "ipywidgets (<8.0.0)", "pytest (>=4.1)", "pytest
 
 [[package]]
 name = "nbconvert"
-version = "6.4.0"
+version = "*"
 description = "Converting Jupyter Notebooks"
 category = "main"
 optional = false
@@ -675,7 +675,7 @@ entrypoints = ">=0.2.2"
 jinja2 = ">=2.4"
 jupyter-core = "*"
 jupyterlab-pygments = "*"
-mistune = ">=0.8.1,<2"
+mistune = "*"
 nbclient = ">=0.5.0,<0.6.0"
 nbformat = ">=4.4"
 pandocfilters = ">=1.4.1"