Update run-from-git instructions

With the switch fromm requirements.txt to pyproject.toml,
the instructions no longer were accurate.

Also add instructions on how to use virtual environment and
how to install optional dependencies.

Author: dconrad5

docs/run-from-git.md

@@ -25,18 +25,32 @@ As gPodder is written in Python, there is no need to compile anything or to inst
 
 ## Optional Dependencies
 
+Defined in pyproject.toml:
+
+* eyed3
+* PySocks
 * html5lib
 * mutagen
+* filelock
+* pillow
 * yt-dlp
 
 ## Instructions
 
+First time setup:
+
     git clone https://github.com/gpodder/gpodder.git
     cd gpodder
+    # MacOS: create virtual environment
+    python3 -m venv ./.venv
+    # MacOS: load virtual environment
+    source ./.venv/bin/activate
     # To install required and optional dependencies
     # (not including git, python or gtk3 dependencies)
-    python3 -m pip install -r tools/requirements.txt         # as root
-    python3 -m pip install --user -r tools/requirements.txt  # as user
+    python3 -m pip install .         # as root, or if in MacOS Virtual Environment
+    python3 -m pip install --user .  # as user
+    # install optional dependencies
+    python3 -m pip install .'[eyed3]' .'[gui]' .'[html5lib]' .'[mutagen]' .'[coverart]' .'[yt-dlp']
     # Optional: Create desktop icon
     python3 tools/create-desktop-icon.py
 
@@ -47,6 +61,13 @@ As gPodder is written in Python, there is no need to compile anything or to inst
     bin/gpo                               # cli client
     bin/gpodder                           # gtk3 client
 
+After that, if on MacOS, do the following:
+
+    cd gpodder
+    source ./.venv/bin/activate
+    export PYTHONPATH=./tools/fake-dbus-module/
+    ./bin/gpodder
+
 ## Updating
 
     cd gpodder