Add new Github issue templates (#2195)

* Add new Github issue templates

* Rename bug_report.md to bug-report.md

* Apply suggestions from code review

Co-authored-by: pierwill <19642016+pierwill@users.noreply.github.com>

* addressed PR feedback

* small updates to issue templates

Co-authored-by: kelseiv <47797004+kelseiv@users.noreply.github.com>
Co-authored-by: pierwill <19642016+pierwill@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Report an issue with the InfluxData documentation.
+title: ''
+labels: ''
+assignees: ''
+---
+
+_Describe the issue here._
+
+##### Relevant URLs
+- _Provide relevant URLs (the doc page in question, project issues, community threads, etc.)_
+
+<!--
+For software issues (bugs, unexpected behavior, etc.) in specific projects,
+create an issue in the appropriate repository:
+
+- InfluxDB OSS issues at https://github.com/influxdata/influxdb
+- Telegraf issues at https://github.com/influxdata/telegraf
+- Chronograf issues at https://github.com/influxdata/chronograf
+- Kapacitor issues at https://github.com/influxdata/kapacitor
+- Flux issues at https://github.com/influxdata/flux
+
+For issues with InfluxDB Cloud or InfluxDB Enterprise, contact support@influxdata.com.
+-->

.github/ISSUE_TEMPLATE/new-feature.md

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+---
+name: New feature
+about: Submit new InfluxData product features that need to be documented.
+title: ''
+labels: ''
+assignees: ''
+---
+
+**PR:** _Provide PR URL(s) for this feature (if available)_
+
+_Describe the new feature here._
+
+<!--
+Include pertinent details, such as:
+
+- What the feature does and why it is useful
+- How to use the feature (via CLI, UI, API)
+- Specific code examples (used/tested)
+- Tips or tricks (hot keys/shortcuts)
+-->
+
+##### Relevant URLs
+- _Provide relevant URLs (issues, community threads, existing doc pages, etc.)_
+
+<!--
+IMPORTANT
+1. Apply product labels to this issue as applicable. For example, if a feature
+   is included in both InfluxDB open source (OSS) and Cloud, add both
+   `InfluxDB v2` and `InfluxDB Cloud` labels.
+
+2. For features tied to a specific product release, add a milestone using the
+   following convention:
+
+   <product-name> <semantic-version>
+
+   Examples: InfluxDB 2.0.5, Telegraf 1.18.0
+-->

.github/ISSUE_TEMPLATE/proposal.md

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+---
+name: Proposal
+about: Propose changes to InfluxData documentation content, structure, layout, etc.
+title: ''
+labels: Proposal
+assignees: ''
+---
+
+_Describe your proposal here._
+
+##### Relevant URLs
+- _Provide relevant URLs_