open-source-silicon.dev

I copied the xschemrc from the pdk lib.tech/xschemrc folder to the local tutorial_layout folder as requested.

<@U078KGW9MEV> See these threads <https://open-source-silicon.slack.com/archives/C017P3RAD42/p1738702422288059>
<https://open-source-silicon.slack.com/archives/C016UL7AQ73/p1738829440983159?thread_ts=1738688377.189689&amp;cid=C016UL7AQ73>

I was copying the xschemrc file from the pdk to my working directory.   This didn't work.  If I instead create a symbolic link in my working directory to the /usr/local/share/sky130A/libs.tech/xschem/xschemrc file,  the tool can find the skywater models.