docs(readme): removes spectrum links

Author: matteovivona

.github/ISSUE_TEMPLATE.md

@@ -10,6 +10,6 @@ Issues should only be posted in this repository after you have been able to repr
 them and confirm that they are a bug or incorrect/missing information in the [docs](https://github.com/HospitalRun/hospitalrun-docs).
 
 For all other questions, requests, help resolving an issue, or if you are not sure if this is
-the right place, please do not open an issue here. Instead, try to find a solution in our [Spectrum channel](https://spectrum.chat/hospitalrun).
+the right place, please do not open an issue here. Instead, try to find a solution in our [Slack workspace](https://hospitalrun-slack.herokuapp.com/).
 
 If you have issues with the [hospitalrun.io](https://www.hospitalrun.io) site, please open an issue [here](https://github.com/HospitalRun/hospitalrun.github.io/issues).

.github/ISSUE_TEMPLATE/bug.md

@@ -3,7 +3,7 @@ name: 🐛 Bug report
 about: Create a report to help us improve
 ---
 
-Before you submit an issue we recommend you drop into our [Spectrum channel](https://spectrum.chat/hospitalrun) and ask any questions you have or mention any problems you've had getting started with HospitalRun.
+Before you submit an issue we recommend you drop into our [Slack workspace](https://hospitalrun-slack.herokuapp.com/) and ask any questions you have or mention any problems you've had getting started with HospitalRun.
 
 **Please read this entire template before posting any issue. If you ignore these instructions
 and post an issue here that does not follow the instructions, your issue might be closed,

.github/ISSUE_TEMPLATE/config.yml

@@ -3,9 +3,6 @@ contact_links:
   - name: Feature request
     url: https://github.com/HospitalRun/hospitalrun/issues/new?template=feature.md
     about: Submit a proposal for a new feature
-  - name: Spectrum Channel
-    url: https://spectrum.chat/hospitalrun
-    about: Please ask and answer questions here.
   - name: Slack Workspace
     url: https://hospitalrun-slack.herokuapp.com/
     about: Please ask and answer questions here.

.github/ISSUE_TEMPLATE/regression.md

@@ -3,7 +3,7 @@ name: 💥 Regression Report
 about: Report unexpected behavior that worked in previous versions
 ---
 
-Before you submit an issue we recommend you drop into our [Spectrum channel](https://spectrum.chat/hospitalrun) and ask any questions you have or mention any problems you've had getting started with HospitalRun.
+Before you submit an issue we recommend you drop into our [Slack workspace](https://hospitalrun-slack.herokuapp.com/) and ask any questions you have or mention any problems you've had getting started with HospitalRun.
 
 **Please read this entire template before posting any issue. If you ignore these instructions
 and post an issue here that does not follow the instructions, your issue might be closed,