Docs: Refactor Variables and Templating content (#23952)

* Moved templating.md

Moved file to a different folder, added alias information, updated menu.yaml

* Split out advanced variable format options from templating.md

* Reworked Advanced variable format options

* Update templating.md

* Moved global variables to another topic

* Moved template files

* Update global-variables.md

* Update global-variables.md

* Update templates-and-variables.md

* made new repeating panels and rows topic

* updated links and menu

* Update advanced-variable-format-options.md

* Update repeat-panels-or-rows.md

* Update menu.yaml

* Update prometheus.md

* Applied Daniel's edits

docs/sources/variables/advanced-variable-format-options.md

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+title = "Advanced variable format options"
+keywords = ["grafana", "templating", "documentation", "guide", "template", "variable"]
+type = "docs"
+[menu.docs]
+name = "advanced-variable-format-options"
+parent = "variables"
+weight = 300
++++
+
+# Advanced variable format options
+
+The formatting of the variable interpolation depends on the data source, but there are some situations where you might want to change the default formatting. 
+
+For example, the default for the MySql data source is to join multiple values as comma-separated with quotes: `'server01','server02'`. In some cases, you might want to have a comma-separated string without quotes: `server01,server02`. You can make that happen with advanced variable formatting options listed below.
+
+## General syntax
+
+Syntax: `${var_name:option}`
+
+Test the formatting options on the [Grafana Play site](https://play.grafana.org/d/cJtIfcWiz/template-variable-formatting-options?orgId=1).
+
+If any invalid formatting option is specified, then `glob` is the default/fallback option.
+
+An alternative syntax (that might be deprecated in the future) is `[[var_name:option]]`.
+
+## CSV
+
+Formats multi-value variable as a comma-separated string.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:csv}'
+Interpolation result: 'test1,test2'
+```
+
+## Distributed - OpenTSDB
+
+Formats multi-value variable in custom format for OpenTSDB.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:distributed}'
+Interpolation result: 'test1,servers=test2'
+```
+
+## Doublequote
+
+Formats single- and multi-valued variables into a comma-separated string, escapes `"` in each value by `\"` and quotes each value with `"`.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:doublequote}'
+Interpolation result: '"test1","test2"'
+```
+
+## Glob - Graphite
+
+Formats multi-value variable into a glob (for Graphite queries).
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:glob}'
+Interpolation result: '{test1,test2}'
+```
+
+## JSON
+
+Formats multi-value variable as a comma-separated string.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:json}'
+Interpolation result: '["test1", "test2"]'
+```
+
+## Lucene - Elasticsearch
+
+Formats multi-value variable in Lucene format for Elasticsearch.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:lucene}'
+Interpolation result: '("test1" OR "test2")'
+```
+
+## Percentencode
+
+Formats single and multi valued variables for use in URL parameters.
+
+```bash
+servers = ['foo()bar BAZ', 'test2']
+String to interpolate: '${servers:percentencode}'
+Interpolation result: 'foo%28%29bar%20BAZ%2Ctest2'
+```
+
+## Pipe
+
+Formats multi-value variable into a pipe-separated string.
+
+```bash
+servers = ['test1.', 'test2']
+String to interpolate: '${servers:pipe}'
+Interpolation result: 'test1.|test2'
+```
+
+## Regex
+
+Formats multi-value variable into a regex string.
+
+```bash
+servers = ['test1.', 'test2']
+String to interpolate: '${servers:regex}'
+Interpolation result: '(test1\.|test2)'
+```
+
+## Singlequote
+
+Formats single- and multi-valued variables into a comma-separated string, escapes `'` in each value by `\'` and quotes each value with `'`.
+
+```bash
+servers = ['test1', 'test2']
+String to interpolate: '${servers:singlequote}'
+Interpolation result: "'test1','test2'"
+```
+
+## Sqlstring
+
+Formats single- and multi-valued variables into a comma-separated string, escapes `'` in each value by `''` and quotes each value with `'`.
+
+```bash
+servers = ["test'1", "test2"]
+String to interpolate: '${servers:sqlstring}'
+Interpolation result: "'test''1','test2'"
+```