Revert to usual RTD configuration

Not working still but nothing we can do about it.

Will need to raise an issue about this.

.readthedocs.yml

@@ -8,6 +8,9 @@ sphinx:
   fail_on_warning: true
 
 python:
-   version: 3.7
+  version: 3.7
-   install:
+  install:
-      - requirements: rtd.txt
+  - method: pip
+    path: .
+    extra_requirements:
+      - docs

documentation/source/conf.py

@@ -6,4 +6,3 @@ master_doc = 'index'
 project = 'hypercore-crypto'
 templates_path = ['_templates']
 extensions = ['sphinx.ext.autodoc', 'sphinx_autodoc_typehints']
-autodoc_mock_imports = ['pysodium']  # no libsodium in the RTD environment

rtd.txt

@@ -1 +0,0 @@
-sphinx-autodoc-typehints >= 1.6.0, < 2.0