Add troubleshooting note for Poetry errors on OSX install (lnbits#1641)

* Update installation.md

for poetry errors on OSX

* Update installation.md

* Update installation.md

* Update installation.md

remove trouble shooting message at top

docs/guide/installation.md

@@ -12,7 +12,7 @@ By default, LNbits will use SQLite as its database. You can also use PostgreSQL
 
 ## Option 1 (recommended): poetry
 
-If you have problems installing LNbits using these instructions, please have a look at the [Troubleshooting](#troubleshooting) section.
+Mininum poetry version has is ^1.2, but it is recommended to use latest poetry. (including OSX)
 
 ```sh
 git clone https://github.com/lnbits/lnbits.git
@@ -190,10 +190,6 @@ sudo apt install python3.9-dev gcc build-essential
 poetry add setuptools wheel
 ```
 
-#### Poetry
-
-If your Poetry version is older than 1.2, for `poetry install`, ignore the `--only main` flag.
-
 ### Optional: PostgreSQL database
 
 If you want to use LNbits at scale, we recommend using PostgreSQL as the backend database. Install Postgres and setup a database for LNbits: